Update syntax

Closes #8

Author: lpil

UltiSnips/gleam.snippets

@@ -17,9 +17,7 @@ snippet let "let binding"
 snippet l "let binding"
 	let ${1} = ${0}
 snippet as "assert binding"
-	assert ${1} = ${0}
-snippet tr "try binding"
-	try ${1} = ${0}
+	let assert ${1} = ${0}
 snippet - "->"
 	-> ${0}
 snippet case "case expression"
@@ -40,24 +38,12 @@ snippet tya "type alias"
 snippet ptya "pub type alias"
 	pub type ${1:Name} =
 		${0:$1}
-snippet ext "external type"
-	external type ${0}
-snippet pext "pub external type"
-	pub external type ${0}
-snippet exfn "external fn"
-	external fn ${1:function_name}(${2}) -> ${3}
-		= "${4}" "${0}"
-snippet pexfn "pub external fn"
-	pub external fn ${1:function_name}(${2}) -> ${3}
-		= "${4}" "${0}"
 snippet im "import"
 	import ${0:gleam/result}
 snippet im. "import exposing"
 	import ${1:gleam/result}.{${0}}
 snippet p "|>"
 	|> ${0}
-snippet tup "tuple()"
-	tuple(${0:${VISUAL}})
 snippet bl "block"
 	{
 		${0:${VISUAL}}
@@ -69,4 +55,4 @@ snippet seq "should.equal"
 snippet strue "should.be_true"
 	should.be_true(${0:${VISUAL}})
 snippet sfalse "should.be_false"
-	should.be_true(${0:${VISUAL}})
+	should.be_false(${0:${VISUAL}})

snippets/gleam.snippets

@@ -8,7 +8,7 @@ let b:current_syntax = "gleam"
 
 " Keywords
 syntax keyword gleamKeyword
-  \ module import pub external
+  \ module import pub panic use
   \ type let as if else todo const
   \ case assert tuple try opaque
 highlight link gleamKeyword Keyword