replace virtualenv with venv

README.md

@@ -41,7 +41,7 @@ Running through the following commands will install the latest release of OctoDN
 ```shell
 $ mkdir dns
 $ cd dns
-$ virtualenv env
+$ python -m venv env
 ...
 $ source env/bin/activate
 $ pip install octodns <provider-specific-requirements>

script/bootstrap

@@ -15,15 +15,18 @@ if [ ! -d "$VENV_NAME" ]; then
     if [ -z "$VENV_PYTHON" ]; then
         VENV_PYTHON=$(command -v python3)
     fi
-    virtualenv --python="$VENV_PYTHON" "$VENV_NAME"
+    "$VENV_PYTHON" -m venv "$VENV_NAME"
 fi
 . "$VENV_NAME/bin/activate"
 
-pip install -U 'pip>=10.0.1'
-pip install -r requirements.txt
+# We're in the venv now, so use the first Python in $PATH. In particular, don't
+# use $VENV_PYTHON - that's the Python that *created* the venv, not the python
+# *inside* the venv
+python -m pip install -U 'pip>=10.0.1'
+python -m pip install -r requirements.txt
 
 if [ "$ENV" != "production" ]; then
-    pip install -r requirements-dev.txt
+    python -m pip install -r requirements-dev.txt
 fi
 
 if [ ! -L ".git/hooks/pre-commit" ]; then

script/cibuild

@@ -8,9 +8,7 @@ script/bootstrap
 
 echo "## environment & versions ######################################################"
 python --version
-pip --version
-VVER=$(virtualenv --version)
-echo "virtualenv $VVER"
+python -m pip --version
 
 if [ -z "$VENV_NAME" ]; then
     VENV_NAME="env"