Change scheme for URLs from http to https where https is available. (#504)

Author: maantje

README.md

@@ -1,14 +1,14 @@
 # GraphQL
 
 The GraphQL specification is edited in the markdown files found in [`/spec`](./spec)
-the latest release of which is published at http://facebook.github.io/graphql/.
+the latest release of which is published at https://facebook.github.io/graphql/.
 
-The latest draft specification can be found at http://facebook.github.io/graphql/draft/
+The latest draft specification can be found at https://facebook.github.io/graphql/draft/
 which tracks the latest commit to the master branch in this repository.
 
 Previous releases of the GraphQL specification can be found at permalinks that
 match their [release tag](https://github.com/facebook/graphql/releases). For
-example, http://facebook.github.io/graphql/October2016/. If you are linking
+example, https://facebook.github.io/graphql/October2016/. If you are linking
 directly to the GraphQL specification, it's best to link to a tagged permalink
 for the particular referenced version.
 
@@ -24,7 +24,7 @@ In order to be broadly adopted, GraphQL will have to target a wide
 variety of backends, frameworks, and languages, which will necessitate a
 collaborative effort across projects and organizations. This specification serves as a point of coordination for this effort.
 
-Looking for help? Find resources [from the community](http://graphql.org/community/).
+Looking for help? Find resources [from the community](https://graphql.org/community/).
 
 ## Getting Started
 

spec/GraphQL.md

@@ -13,7 +13,7 @@ this open standard started in 2015.
 GraphQL has evolved and may continue to evolve in future editions of this
 specification. Previous editions of the GraphQL specification can be found at
 permalinks that match their [release tag](https://github.com/facebook/graphql/releases).
-The latest working draft release can be found at [facebook.github.io/graphql/draft/](http://facebook.github.io/graphql/draft/).
+The latest working draft release can be found at [facebook.github.io/graphql/draft/](https://facebook.github.io/graphql/draft/).
 
 **Copyright notice**
 

spec/Section 2 -- Language.md

@@ -19,7 +19,7 @@ used in this document.
 SourceCharacter :: /[\u0009\u000A\u000D\u0020-\uFFFF]/
 
 GraphQL documents are expressed as a sequence of
-[Unicode](http://unicode.org/standard/standard.html) characters. However, with
+[Unicode](https://unicode.org/standard/standard.html) characters. However, with
 few exceptions, most of GraphQL is expressed only in the original non-control
 ASCII range so as to be as widely compatible with as many existing tools,
 languages, and serialization formats as possible and avoid display issues in

spec/Section 3 -- Type System.md

@@ -179,7 +179,7 @@ made available via introspection.
 
 To allow GraphQL service designers to easily publish documentation alongside the
 capabilities of a GraphQL service, GraphQL descriptions are defined using the
-Markdown syntax (as specified by [CommonMark](http://commonmark.org/)). In the
+Markdown syntax (as specified by [CommonMark](https://commonmark.org/)). In the
 type system definition language, these description strings (often {BlockString})
 occur immediately before the definition they describe.
 
@@ -438,7 +438,7 @@ encoding integer numbers larger than 32-bit.
 ### Float
 
 The Float scalar type represents signed double-precision fractional values
-as specified by [IEEE 754](http://en.wikipedia.org/wiki/IEEE_floating_point).
+as specified by [IEEE 754](https://en.wikipedia.org/wiki/IEEE_floating_point).
 Response formats that support an appropriate double-precision number type
 should use that type to represent this scalar.
 
@@ -517,7 +517,7 @@ often numeric, it should always serialize as a `String`.
 GraphQL is agnostic to ID format, and serializes to string to ensure consistency
 across many formats ID could represent, from small auto-increment numbers, to
 large 128-bit random numbers, to base64 encoded values, or string values of a
-format like [GUID](http://en.wikipedia.org/wiki/Globally_unique_identifier).
+format like [GUID](https://en.wikipedia.org/wiki/Globally_unique_identifier).
 
 GraphQL servers should coerce as appropriate given the ID formats they expect.
 When coercion is not possible they must raise a field error.
@@ -1765,7 +1765,7 @@ to indicate deprecated portions of a GraphQL service's schema, such as
 deprecated fields on a type or deprecated enum values.
 
 Deprecations include a reason for why it is deprecated, which is formatted using
-Markdown syntax (as specified by [CommonMark](http://commonmark.org/)).
+Markdown syntax (as specified by [CommonMark](https://commonmark.org/)).
 
 In this example type definition, `oldField` is deprecated in favor of
 using `newField`.

spec/Section 4 -- Introspection.md

@@ -71,7 +71,7 @@ underscores.
 All types in the introspection system provide a `description` field of type
 `String` to allow type designers to publish documentation in addition to
 capabilities. A GraphQL server may return the `description` field using Markdown
-syntax (as specified by [CommonMark](http://commonmark.org/)). Therefore it is
+syntax (as specified by [CommonMark](https://commonmark.org/)). Therefore it is
 recommended that any tool that displays `description` use a CommonMark-compliant
 Markdown renderer.