Merge branch 'master' into app-dir-fix

Author: CaseyFaist

CHANGELOG.md

@@ -4,11 +4,13 @@
 
 - Refactor: use variable rather than hardcoded /app
 - Bug fix: pipenv no longer installs twice on CI
-- Unpin Heroku-18 binary build deps
-- Typo fixes
 
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+# 157 (2019-09-18)
+
+- Typo fixes
+
 # 156 (2019-09-12)
 
 - Python 3.6.9 and 3.7.4 now available.