update discord link

Author: nschloe

README.md

@@ -10,7 +10,7 @@
 [![GitHub stars](https://img.shields.io/github/stars/nschloe/tikzplotlib.svg?style=flat-square&logo=github&label=Stars&logoColor=white)](https://github.com/nschloe/tikzplotlib)
 [![PyPi downloads](https://img.shields.io/pypi/dm/tikzplotlib.svg?style=flat-square)](https://pypistats.org/packages/tikzplotlib)
 
-[![Discord](https://img.shields.io/static/v1?logo=discord&label=chat&message=on%20discord&color=7289da&style=flat-square)](https://discord.com/channels/818781969562599434/818781969562599438)
+[![Discord](https://img.shields.io/static/v1?logo=discord&label=chat&message=on%20discord&color=7289da&style=flat-square)](https://discord.gg/hnTJ5MRX2Y)
 [![Documentation Status](https://readthedocs.org/projects/tikzplotlib/badge/?version=latest&style=flat-square)](https://readthedocs.org/projects/tikzplotlib/?badge=latest)
 [![awesome](https://img.shields.io/badge/awesome-yes-brightgreen.svg?style=flat-square)](https://github.com/nschloe/tikzplotlib)
 

test/test_horizontal_alignment.py

@@ -1,6 +1,5 @@
-import numpy as np
 import matplotlib.pyplot as plt
-
+import numpy as np
 from helpers import assert_equality
 
 

test/test_legend_best_location.py

@@ -1,7 +1,6 @@
 import matplotlib.pyplot as plt
 import numpy as np
 import pytest
-
 from helpers import assert_equality
 
 

test/test_readme.py

@@ -12,7 +12,7 @@
     "string,lineno",
     exdown.extract(this_dir.parent / "README.md", syntax_filter="python"),
 )
-def test_readme(string, lineno):
+def test_readme(string, _):
     exec(string)
 
     # Close figure and reset defaults