build(deps): pin click<7.1 (#99)

* build(deps): pin click<7.1

Fixes #95.

* ci: fix py34

.circleci/config.yml

@@ -2,7 +2,7 @@
 #
 # Check https://circleci.com/docs/2.0/language-python/ for more details
 #
-version: 2
+version: 2.1
 
 common: &common
   working_directory: ~/repo
@@ -96,7 +96,6 @@ jobs:
           TOXENV=checkqa
 
 workflows:
-  version: 2
   test:
     jobs:
       - py38
@@ -105,7 +104,10 @@ workflows:
       - py37-click6
       - py36
       - py35
-      - py34
+      - py34:
+          pre-steps:
+            - run: sudo pip install -U pip==19.1.1
+            - run: pip install --user setuptools==42.0.2 virtualenv==20.4.3
       - py27
       - checkqa
 

setup.py

@@ -81,7 +81,7 @@ def run(self):
     ],
     install_requires=[
         'attrs>=16.1.0',
-        'click',
+        'click<7.1',
         'coverage<5.0a6',
     ],
     extras_require={

tox.ini

@@ -15,6 +15,8 @@ deps =
   coverage: pytest-cov
   coveragepy4: coverage<5
   coveragepy5: coverage==5.0a5
+  # Use blueyed/pytest, pytest itself would pull in incompatible attrs.
+  py34: pytest @ git+https://github.com/blueyed/[email protected]
 
 [testenv:checkqa]
 extras = qa