.travis.yml in Ascii85-1.0.3 vs .travis.yml in Ascii85-1.1.0

@@ -1,7 +1,30 @@
 language: ruby
 rvm:
-  - 1.8
   - 1.9
+  - 2.0
+  - 2.1
+  - 2.2
+  - 2.3
+  - 2.4
   - 2.5
+  - 2.6
+  - 2.7
   - ruby-head
   - jruby
+  - truffleruby
+env:
+  - RUBYOPT="--enable-frozen-string-literal"
+  - RUBYOPT=""
+matrix:
+  exclude:
+    - rvm: 1.9
+      env: RUBYOPT="--enable-frozen-string-literal"
+    - rvm: 2.0
+      env: RUBYOPT="--enable-frozen-string-literal"
+    - rvm: 2.1
+      env: RUBYOPT="--enable-frozen-string-literal"
+    - rvm: 2.2
+      env: RUBYOPT="--enable-frozen-string-literal"
+    # bundler did not support this back then
+    - rvm: 2.3
+      env: RUBYOPT="--enable-frozen-string-literal"