s/--constraints=/--constraint=/g

Author: xolox

requirements-checks.txt

@@ -1,7 +1,7 @@
 # Python packages required to run `make check'.
 
 # Enable Python version compatibility.
---constraints=constraints.txt
+--constraint=constraints.txt
 
 flake8 >= 2.6.0
 flake8-docstrings >= 0.2.8

requirements-tests.txt

@@ -1,7 +1,7 @@
 # Python packages required to run `make test'.
 
 # Enable Python version compatibility.
---constraints=constraints.txt
+--constraint=constraints.txt
 
 pytest >= 3.0.7
 pytest-cov >= 2.2.1

requirements-travis.txt

@@ -1,7 +1,7 @@
 # Python packages required on Travis CI.
 
 # Enable Python version compatibility.
---constraints=constraints.txt
+--constraint=constraints.txt
 
 # Pull in the requirements for code style checks,
 # the test suite and installation requirements.