bump to latest phlex

[davekaro]

I wasn't able to figure out how to run the tests, nor how to run my branch against my own project (bundler didn't seem to pickup the gemspec change, so I couldn't get the latest phlex). So, I decided to open a PR to get started.

Looking at the changelog, I don't think there is any reason phlox-rails wouldn't be compatible with phlex 1.11.

[cirdes]

I'm facing a similar problem here:

Gemfile

gem "phlex", "1.11.0"
gem "phlex-rails", "1.2.1"

bundle

Fetching gem metadata from https://rubygems.org/........
Resolving dependencies...
Could not find compatible versions

Because phlex-rails >= 1.2.0 depends on phlex ~> 1.10.0
  and Gemfile depends on phlex = 1.11.0,
  phlex-rails >= 1.2.0 cannot be used.
So, because Gemfile depends on phlex-rails = 1.2.1,
  version solving has failed.