CONT-234 Create MVP

This PR is an MVP and gets the current minimal set of tests passing.

- modified Craig's tests to include a test for no problems - 3 tests haven't been coded for and are therefore marked as pending
- added a check which gets the tests passing. ie the check:
  - identifies exec resources and identifies any commands (command, onlyif and unless) in the exec
  - it parses command statements and checks for any input variables
  - if so it raises an warning
- removed dependabot for now

TODO:
- this is an MVP so more functionality needs to be added on top
- will add extra checks on commands for various instances of unsanitised input

Author: GSPatton

lib/puppet-lint/plugins/version.rb

@@ -1,3 +1,4 @@
+# version of this gem
 class CheckUnsafeInterpolations
   VERSION ||= '0.0.1'.freeze
 end