CircleCI: Avoid reinstallation of language-check

On CircleCI, an explicit install of language-check 0.8
was being done despite the relevant bear now having a
requirement on language-check 1.0.  This results in
language-check 1.0 being installed, then replaced with
language-check 0.8.

Fixes coala#1863

.ci/deps.pip.sh

@@ -21,7 +21,6 @@ for dep_version in "${dep_versions[@]}" ; do
   pip install -U setuptools
   pip install -r test-requirements.txt
   pip install -r requirements.txt
-  pip install language_check==0.8.*
 done
 
 pip install -r docs-requirements.txt