reqs: add wheel to requirements.txt

Signed-off-by: Ruslan Kuprieiev <[email protected]>

.travis.yml

@@ -47,7 +47,6 @@ before_install:
       eval "$(pyenv init -)";
       PYTHON_CONFIGURE_OPTS="--enable-framework" pyenv install --skip-existing --keep --verbose "$PYTHON_VER";
       pyenv shell "$PYTHON_VER";
-      pip install wheel;
     fi
   - which python
   - which pip

requirements.txt

@@ -21,3 +21,4 @@ binaryornot==0.4.4
 jsonpath-rw==1.4.0
 reflink==0.2.0
 requests>=2.18.4
+wheel>=0.31.1