Adding upstream version 0.15.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

docs/index.md

@@ -15,7 +15,7 @@ Great for use as a [commit-msg git hook](#using-gitlint-as-a-commit-msg-hook) or
 
 
 !!! important
-    **Gitlint will soon be dropping support for Python 2.7 and Python 3.5 as they [have reached End-Of-Life](https://endoflife.date/python)**.
+    **Gitlint no longer supports Python 2.7 and Python 3.5 as they [have reached End-Of-Life](https://endoflife.date/python). The last gitlint version to support Python 2.7 and Python 3.5 is `0.14.0` (released on October 24th, 2020).**
 
 ## Features
  - **Commit message hook**: [Auto-trigger validations against new commit message right when you're committing](#using-gitlint-as-a-commit-msg-hook). Also [works with pre-commit](#using-gitlint-through-pre-commit).
@@ -39,8 +39,8 @@ useful throughout the years.
 pip install gitlint
 
 # macOS
-brew tap rockyluke/devops
 brew install gitlint
+sudo port install gitlint  # alternative using macports
 
 # Ubuntu
 apt-get install gitlint
@@ -219,11 +219,14 @@ your `.pre-commit-config.yaml` file like so:
     rev:  # Fill in a tag / sha here
     hooks:
     -   id: gitlint
-        stages: [commit-msg]
-        entry: gitlint
         args: [--contrib=CT1, --msg-filename]
 ```
 
+!!! important
+
+    You need to add `--msg-filename` at the end of your custom `args` list as the gitlint-hook will fail otherwise.
+
+
 ## Using gitlint in a CI environment
 By default, when just running `gitlint` without additional parameters, gitlint lints the last commit in the current
 working directory.
@@ -426,4 +429,4 @@ Exit Code  | Description
 -----------|------------------------------------------------------------
 253        | Wrong invocation of the `gitlint` command.
 254        | Something went wrong when invoking git.
-255        | Invalid gitlint configuration
+255        | Invalid gitlint configuration