Remove .ruby-version from version control

Similarly to dependencies libraries are often required to support many
versions of the platform they run on unlike most applications which are
known to work and maintained on a single version.

Removing this Ruby version specifier will be more conducive to testing
on multiple Ruby VM versions.

Author: bestie

.gitignore

@@ -1,2 +1,3 @@
 .env
+.ruby-version
 Gemfile.lock