Add phip1611 as co-author

phil-opp · phil-opp · commit 111695523789 · 2021-10-07T16:53:11.000+02:00
diff --git a/content/this-month/2021-09/index.md b/content/this-month/2021-09/index.md
@@ -6,6 +6,7 @@ date = 2021-10-07
 month = "September 2021"
 authors = [
     "phil-opp",
+    "phip1611",
     # add yourself here
 ]
 +++
