Introduce CHANGELOG.md along with release 3.4.0

CHANGELOG.md

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+## 3.4.1 (Unreleased)
+## 3.4.0 (August 18, 2017)
+
+FEATURES:
+
+- config: Introduce logging to file w/ log file re-open on SIGUSR1 (#477)
+- add raw logging field to bypass logger for exec (#462)
+
+BUG FIXES:
+
+- control: HTTPServer should handle existing control socket files (#480)
+- docs: Better language around `stopTimeout` (#479)
+- fix GOOS setting in makefile (#483)
+- discovery: fix tls config for Consul (#481)
+- default restarts to "unlimited" when when->interval is set (#473)
+- docs: add pointers to godoc (#475)
+
+SHA1 ff14bfc9f6b7a10654b0c8777175c2b0436575aa
+
+## 3.3.4 (August 9, 2017)
+
+BUG FIXES:
+
+* fix race that can sometimes cause deadlock during reload/shutdown with larger numbers of jobs (#468) (#469)
+
+SHA1 806f28a25a06acdbcfa8940c8968d5f8e20a2c4f
+
+## 3.3.3 (August 8, 2017)
+
+BUG FIXES:
+
+- make sure jobs configured for stopping/stopped exit on shutdown/reload (#465) (#466)
+
+SHA1 8d680939a8a5c8b27e764d55a78f5e3ae7b42ef4
+
+## 3.3.2 (August 2, 2017)
+
+BUG FIXES:
+
+- Fix when->timeout canceling running jobs (#456) (#458)
+
+SHA1 056d45f728e9b9c61793d6f994da291d5eebeabd
+
+## 3.3.1 (July 31, 2017)
+
+BUG FIXES:
+
+- fixed bug where `/status` always reported job as "unknown" status (#445) (#450)
+- fixed bug where job exec was getting `SIGKILL` instead of `SIGTERM` on ContainerPilot stop (#448) (#449)
+- fixed bug where supervisor's `SIGCHLD` handler could block `SIGTERM`/`SIGINT` handlers
+
+SHA1 e27c1b9cd1023e622f77bb19914606dee3c9b22c
+
+## 2.7.7 (July 31, 2017)
+
+BUG FIXES:
+
+- Backport supervisor process to v2 to avoid race in zombie cleanup after timeout (#447) (#452)
+
+SHA1 030f1e54a43a842d38b30373f8847132a9771829
+
+## 3.3.0 (July 19, 2017)
+
+BUG FIXES:
+
+- move child reaping into supervisor process (#439) (#440)
+- bugfix for catching another when event stopping the running job (#417) (#438)