adding requirements_dev.txt

.travis.yml

@@ -5,8 +5,7 @@ python:
 
 install:
   - pip install --upgrade pip
-  - pip install "pytest>=3.6"
-  - pip install codecov pytest-cov pytest-asyncio pylint
+  - pip install -r requirements_dev.txt
   - python setup.py develop
 
 script:

README.md

@@ -21,7 +21,8 @@ py-libp2p requires Python 3.6 and the best way to guarantee a clean Python 3.6 e
 ```sh
 virtualenv -p python3.6 venv
 . venv/bin/activate
-pip3 install -r requirements.txt
+pip3 install -r requirements_dev.txt
+python setup.py develop
 ```
 
 ## Testing

requirements_dev.txt

@@ -0,0 +1,5 @@
+pytest>=3.6
+codecov
+pytest-cov
+pytest-asyncio
+pylint