Support of ruby 2.2.7

[ShockwaveNN]

Ruby 2.2.7 released yesterday
So I think it need to be added to build matrix like this was done with Ruby 2.4.1 some time ago (#7512)
Currently using it cause error:

rvm use 2.2.7 --install --binary --fuzzy
ruby-2.2.7 is not installed - installing.
Searching for binary rubies, this might take some time.
Requested binary installation but no rubies are available to download, consider skipping --binary flag.
Gemset '' does not exist, 'rvm ruby-2.2.7 do rvm gemset create ' first, or append '--create'.
The command "rvm use 2.2.7 --install --binary --fuzzy" failed and exited with 2 during .

[timbru31]

@ShockwaveNN ruby 2.2.7 is working fine for me now 👍
@BanzaiMan could you kick the build matrix for newly released 2.3.4 version?

[tagliala]

Hi,

I'm the author of #7512

2.2.7 is working for me, 2.3.4 isn't.

Should I open another issue for 2.3.4 ?

[BanzaiMan]

2.2.7 is available for Linux, OS X 10.11 and macOS 10.12.

2.3.4 for Linux.

[ShockwaveNN]

Everything seems fine with ruby 2.2.7 and 2.3.4 now