Updating changelog when building releases (#192)

* Updating changelog when building releases

* Further differentiating the file names

* Cleaning up the version change commands

* Replacing only the first occurance of # Unreleased

* Updated sed command; Updated changelog for #193

Author: hiranya911

CHANGELOG.md

@@ -1,9 +1,11 @@
 # Unreleased
-- 
+
+- [changed] Exposed `admin.firestore.DocumentReference` and
+  `admin.firestore.DocumentSnapshot` types from the Admin SDK typings.
 
 # v5.8.1
 
-- [changed]  Upgraded Firestore dependency version from 0.10.0 to 0.11.1.
+- [changed] Upgraded Firestore dependency version from 0.10.0 to 0.11.1.
   This includes several bug fixes in Cloud Firestore.
 
 # v5.8.0

createReleaseTarball.sh

@@ -88,6 +88,13 @@ echo "[INFO] Updating version number in package.json to ${VERSION_WITHOUT_RC}...
 sed -i '' -e s/"\"version\": \".*\""/"\"version\": \"${VERSION_WITHOUT_RC}\""/ package.json
 echo
 
+#########################
+#  UPDATE CHANGELOG.md  #
+#########################
+echo "[INFO] Updating version number in CHANGELOG.md to ${VERSION_WITHOUT_RC}..."
+sed -i '' -e "1 s/# Unreleased//" CHANGELOG.md
+echo -e "# Unrelased\n\n-\n\n# v${VERSION_WITHOUT_RC}" | cat - CHANGELOG.md > TEMP_CHANGELOG.md
+mv TEMP_CHANGELOG.md CHANGELOG.md
 
 ############################
 #  REINSTALL DEPENDENCIES  #