Remove vendored pip-diff script

Since the last usage was removed in #1117. Whilst this tool was intended for internal buildpack usage only, the vendor directory is on `PATH`, so I've documented the removal in CHANGELOG just in case. Refs @W-8208817@.
heroku · Nov 12, 2020 · ee65e0e · ee65e0e
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## Unreleased
 
+- Remove vendored `pip-diff` script (#1118).
 - Remove vendored `pip-grep` script (#1116).
 
 ## v185 (2020-11-12)

diff --git a/vendor/pip-pop/pip-diff b/vendor/pip-pop/pip-diff