Add hrfuller as code owner for pip_parse (#874)

diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index a35be61..ed4bcf3 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -4,3 +4,6 @@
 
 # Directory containing the Gazelle extension and Go code.
 /gazelle/ @f0rmiga
+
+# pip_parse related code
+/python/pip_install/ @hrfuller