Pin Node version to 11

KevOrr · Patrick Thomson · commit 40e73b4bc74b · 2019-08-16T16:11:56.000-04:00
See tree-sitter/node-tree-sitter#46 (comment) and bash-lsp/bash-language-server#131 (comment)
diff --git a/.travis.yml b/.travis.yml
@@ -3,7 +3,7 @@ language: node_js
 sudo: false
 
 node_js:
-  - "node"
+  - "11"
 
 compiler: clang
 env: CXX=clang
diff --git a/appveyor.yml b/appveyor.yml
@@ -1,7 +1,7 @@
 image: Visual Studio 2015
 
 environment:
-  nodejs_version: "8"
+  nodejs_version: "11"
 
 platform:
   - x64
