Add RHEL 8 to Galaxy's metadata and bump Ansible Lint to 4.3.4 (#21)

Author: alessfg

.travis.yml

@@ -37,7 +37,7 @@ before_install:
   - sudo apt-get -y -o Dpkg::Options::="--force-confnew" install docker-ce
 install:
   - pip install ansible==2.9.13
-  - pip install ansible-lint==4.3.3
+  - pip install ansible-lint==4.3.4
   - pip install molecule==3.0.8
   - pip install docker==4.3.1
 script:

meta/main.yml

@@ -27,6 +27,7 @@ galaxy_info:
       versions:
         - 6
         - 7
+        - 8
     - name: FreeBSD
       versions:
         - 11.2