Merge pull request #4261 from rtfd/agj/hotfix-pip10

Revert "Merge pull request #4206 from FlorianKuckelkorn/fix/pip-breaking-change"

Author: ericholscher

readthedocs/doc_builder/python_environments.py

@@ -253,7 +253,7 @@ def install_core_requirements(self):
             'python',
             self.venv_bin(filename='pip'),
             'install',
-            '--only-binary=:all:',
+            '--use-wheel',
             '--upgrade',
             '--cache-dir',
             self.project.pip_cache_path,

readthedocs/rtd_tests/tests/test_doc_building.py

@@ -1137,7 +1137,7 @@ def setUp(self):
             'python',
             mock.ANY,  # pip path
             'install',
-            '--only-binary=:all:',
+            '--use-wheel',
             '--upgrade',
             '--cache-dir',
             mock.ANY,  # cache path