Automatic release update warnings. (#1336)

* Hide pretty help

* Automatic release update warnings.

* `httpie cli check-updates`

* adapt to the new loglevel construct

* Don't make the pie-colors the bold

* Apply review feedback.

Co-authored-by: Jakub Roztocil <jakub@roztocil.co>

setup.py

@@ -13,6 +13,7 @@ tests_require = [
     'pytest-httpbin>=0.0.6',
     'pytest-lazy-fixture>=0.0.6',
     'responses',
+    'pytest-mock',
     'werkzeug<2.1.0'
 ]
 dev_require = [