update changelog for release 0.7.15
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+# 0.7.15 - use a file system lock when merging pact files
+
+* eae1b16 - chore: fix clippy errors (Ronald Holshausen, Mon Feb 8 14:57:42 2021 +1100)
+* 9976e80 - feat: added read locks and a mutex guard to reading and writing pacts (Ronald Holshausen, Mon Feb 8 11:58:52 2021 +1100)
+* 61e16ed - feat: use a file system lock when merging pact files (Ronald Holshausen, Sun Feb 7 17:00:29 2021 +1100)
+* 49a3cf2 - refactor: use bytes crate instead of vector of bytes for body content (Ronald Holshausen, Sun Feb 7 14:43:40 2021 +1100)
+* e43fdb8 - chore: upgrade maplit, itertools (Audun Halland, Mon Jan 11 05:30:10 2021 +0100)
+* 45ae48e - bump version to 0.7.15 (Ronald Holshausen, Mon Jan 11 10:05:50 2021 +1100)
+
# 0.7.14 - Updated dependencies
* 4a70bef - chore: upgrade expectest to 0.12 (Audun Halland, Sat Jan 9 11:29:29 2021 +0100)
