pkgdev_bugs: add warning about using --api-key, document ~/.bugz_token

Signed-off-by: Florian Schmaus <flow@gentoo.org>
Closes: #159
Signed-off-by: Arthur Zamarin <arthurzam@gentoo.org>

Author: Flowdalic

src/pkgdev/scripts/pkgdev_bugs.py

@@ -42,7 +42,9 @@
     metavar="KEY",
     help="Bugzilla API key",
     docs="""
-        The Bugzilla API key to use for authentication.
+        The Bugzilla API key to use for authentication. WARNING: using this
+        option will expose your API key to other users of the same system.
+        Consider instead saving your API key in a file named ~/.bugz_token.
     """,
 )
 bugs.add_argument(