Fix ci for python < 3.6

dmerejkowsky · dmerejkowsky · commit 7c305fd6aacd · 2018-12-09T18:01:17.000+01:00
diff --git a/ci.sh b/ci.sh
@@ -1,7 +1,7 @@
 set -x
 set -e
 
-black --check .
+which black && black --check .
 MYPYPATH=stubs mypy --ignore-missing-imports --strict cli_ui
 pyflakes cli_ui/__init__.py cli_ui/tests/test_cli_ui.py
 pytest
diff --git a/requirements.lock b/requirements.lock
@@ -4,7 +4,7 @@ appdirs==1.4.3
 atomicwrites==1.2.1
 attrs==18.2.0
 Babel==2.6.0
-black==18.9b0
+black==18.9b0 ; python_version >= "3.6"
 bleach==3.0.2
 certifi==2018.11.29
 chardet==3.0.4
