.travis.yml in tpm-key_attestation-0.1.0 vs .travis.yml in tpm-key_attestation-0.2.0

@@ -1,6 +1,28 @@
 ---
+dist: bionic
 language: ruby
 cache: bundler
+
 rvm:
+  - ruby-head
   - 2.7.0
-before_install: gem install bundler -v 2.1.4
+  - 2.6.5
+  - 2.5.7
+  - 2.4.9
+  - 2.3.8
+
+gemfile:
+  - gemfiles/openssl_head.gemfile
+  - gemfiles/openssl_2_1.gemfile
+  - gemfiles/openssl_2_0.gemfile
+  - gemfiles/openssl_default.gemfile
+
+matrix:
+  fast_finish: true
+  allow_failures:
+    - rvm: ruby-head
+    - gemfile: gemfiles/openssl_head.gemfile
+
+before_install:
+  - gem install bundler -v "~> 2.0"
+  - rm Gemfile.lock