Update github actions

- remove Java 16 support
- move continue-on-error
- remove travis.yml

.github/workflows/test-pr.yml

@@ -9,17 +9,16 @@ jobs:
     name: Checkout and Build
     runs-on: ubuntu-latest
 
-    continue-on-error: true
-
     strategy:
       fail-fast: false
       matrix:
-        java-version: [8, 11, 16, 17, 21]
+        java-version: [8, 11, 17, 21]
 
     steps:
       - uses: actions/checkout@v4
       - name: JDK setup
         uses: actions/setup-java@v4
+        continue-on-error: true
         with:
           java-version: ${{ matrix.java-version }}
           distribution: 'temurin'

README.md

@@ -1,5 +1,5 @@
 # veraPDF-wcag-algs
 
-A collection of algorithms implementing validation of various WCAG 2.1 rules on top of the PDF/UA-1 (Machine) validation profile. 
+A collection of algorithms implementing validation of various WCAG 2.1 / WCAG 2.2 rules on top of the PDF/UA-1 (Machine) validation profile. 
 
 For the moment This includes heuristics calculating the correctness of the structure tree and the contrast ratio for text elements.