Add version lock to the readme, so project will specify that themselves

README.md

@@ -44,7 +44,7 @@ Usage
         - os: osx
 
     script:
-      - pip install cibuildwheel
+      - pip install cibuildwheel==0.1.1
       - cibuildwheel --output-dir wheelhouse
     ```
 
@@ -54,7 +54,7 @@ Usage
 
     ```
     build_script:
-      - pip install cibuildwheel
+      - pip install cibuildwheel==0.1.1
       - cibuildwheel --output-dir wheelhouse
     artifacts:
       - path: "wheelhouse\\*.whl"

setup.cfg

@@ -6,3 +6,6 @@ message = Bump version
 
 [bumpversion:file:setup.py]
 
+[bumpversion:file:README.md]
+search = cibuildwheel=={current_version}
+replace = cibuildwheel=={new_version}