Update to latest v1.13.x

README.md

@@ -19,7 +19,7 @@ steps:
 - uses: actions/checkout@master
 - uses: actions/setup-go@v1
   with:
-    go-version: '1.9.3' # The Go version to download (if necessary) and use.
+    go-version: '1.13.x' # The Go version to download (if necessary) and use, default to latest v1.13.x
 - run: go run hello.go
 ```
 
@@ -30,7 +30,7 @@ jobs:
     runs-on: ubuntu-16.04
     strategy:
       matrix:
-        go: [ '1.8', '1.9.3', '1.10.x' ]
+        go: [ '1.11', '1.12.12', '1.13.x' ]
     name: Go ${{ matrix.go }} sample
     steps:
       - uses: actions/checkout@master

action.yml

@@ -3,8 +3,8 @@ description: 'Setup a Go environment and add it to the PATH, additionally provid
 author: 'GitHub'
 inputs:
   go-version:
-    description: 'The Go version to download (if necessary) and use. Example: 1.9.3'
+    description: 'The Go version to download (if necessary) and use. Example: 1.13.3'
-    default: '1.10'
+    default: '1.13.x'
 # Deprecated option, do not use. Will not be supported after October 1, 2019
   version:
     description: 'Deprecated. Use go-version instead. Will not be supported after October 1, 2019'