Update PYENV_VIRTUALENV_VERSION (#449)

Co-authored-by: Jack McIvor <[email protected]>

Author: jack-mcivor

bin/pyenv-virtualenv

@@ -13,7 +13,7 @@
 #   -u/--upgrade     Imply --force
 #
 
-PYENV_VIRTUALENV_VERSION="1.1.5"
+PYENV_VIRTUALENV_VERSION="1.2.1"
 
 set -e
 [ -n "$PYENV_DEBUG" ] && set -x