Arch Linux

Description:
Completion script fail due to missing jinja template in downstream package.

~$ pipenv --completion
Traceback (most recent call last):
File "/usr/bin/pipenv", line 11, in <module>
load_entry_point('pipenv==2018.6.25', 'console_scripts', 'pipenv')()
File "/usr/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 722, in __call__
return self.main(*args, **kwargs)
File "/usr/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 697, in main
rv = self.invoke(ctx)
File "/usr/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 1043, in invoke
return Command.invoke(self, ctx)
File "/usr/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 895, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/usr/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 535, in invoke
return callback(*args, **kwargs)
File "/usr/lib/python3.6/site-packages/pipenv/vendor/click/decorators.py", line 17, in new_func
return f(get_current_context(), *args, **kwargs)
File "/usr/lib/python3.6/site-packages/pipenv/cli.py", line 178, in cli
print(click_completion.get_code(shell=shell, prog_name='pipenv'))
File "/usr/lib/python3.6/site-packages/pipenv/vendor/click_completion/__init__.py", line 353, in get_code
template = env.get_template('%s.j2' % shell)
File "/usr/lib/python3.6/site-packages/pipenv/vendor/jinja2/environment.py", line 830, in get_template
return self._load_template(name, self.make_globals(globals))
File "/usr/lib/python3.6/site-packages/pipenv/vendor/jinja2/environment.py", line 804, in _load_template
template = self.loader.load(self, name, globals)
File "/usr/lib/python3.6/site-packages/pipenv/vendor/jinja2/loaders.py", line 113, in load
source, filename, uptodate = self.get_source(environment, name)
File "/usr/lib/python3.6/site-packages/pipenv/vendor/jinja2/loaders.py", line 187, in get_source
raise TemplateNotFound(template)
jinja2.exceptions.TemplateNotFound: bash.j2

Additional info:
* tested on version 2018.6.25-1

Steps to reproduce:
1. run pipenv --completion