update python/pip commands in README

README.md

@@ -28,13 +28,13 @@ cd my-env
 . bin/activate
 git clone https://github.com/geopython/geolinks.git
 cd geolinks
-python setup.py build
-python setup.py install
+python3 setup.py build
+python3 setup.py install
 ```
 
 via pip:
 ```bash
-pip install geolinks
+pip3 install geolinks
 ```
 
 ## Running
@@ -63,10 +63,10 @@ geolinks link sniff 'http://host/wms?service=WMS'
 
 ```bash
 # via setuptools
-python setup.py test
+python3 setup.py test
 # manually
 cd tests
-python run_tests.py
+python3 run_tests.py
 ```
 
 ## Development
@@ -77,7 +77,7 @@ Same as installing a package.  Use a virtualenv.  Also install developer
 requirements:
 
 ```bash
-pip install -r requirements-dev.txt
+pip3 install -r requirements-dev.txt
 ```
 
 ## Releasing
@@ -92,7 +92,7 @@ git tag -a x.y.z -m 'tagging release x.y.z'
 # push tag
 git push --tags
 rm -fr build dist *.egg-info
-python setup.py sdist bdist_wheel --universal
+python3 setup.py sdist bdist_wheel --universal
 twine upload dist/*
 ```