chore: update packages, add node16 support

Author: LouisBrunner

README.md

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v1
-    - uses: LouisBrunner/diff-action@v0.1.0
+    - uses: LouisBrunner/diff-action@v0.2.0
       with:
         old: file1.txt
         new: file2.txt

action.yml

@@ -39,5 +39,5 @@ outputs:
   output:
     description: 'text of the diff'
 runs:
-  using: 'node12'
+  using: 'node16'
   main: 'dist/index.js'