Add patch fixing tab-qiime, call python3 instead of python

Description: call python3 in the tab-qiime script, as the package is python3 only

From: Alex Mestiashvili <amestia@rsh2.donotuse.de>

--- q2cli.orig/bin/tab-qiime

+++ q2cli/bin/tab-qiime

@@ -13,7 +13,7 @@

 {

   # Attempt to find the cached completion script. If q2cli isn't installed, or

   # is an incompatible version, don't attempt completion.

-  local completion_path="$(python -c "import q2cli.util; print(q2cli.util.get_completion_path())" 2> /dev/null)"

+  local completion_path="$(python3 -c "import q2cli.util; print(q2cli.util.get_completion_path())" 2> /dev/null)"

   if [[ $? != 0 ]]; then

     unset COMPREPLY

call_py3.patch