chore: Changelog update

.env.example

@@ -3,3 +3,5 @@ LOG_FORMAT=ansi
 LOG_FILE=/var/log/crontab-go.log
 LOG_STDOUT=true
 LOG_LEVEL=debug
+SHELL=/usr/bin/bash
+SHELL_ARGS=-c

CHANGELOG.md

@@ -0,0 +1,21 @@
+# Changelog
+
+## v0.1
+
+* Initial release
+* Added support for multiple scheduler methods:
+  * Cron string (with seconds)
+  * Interval (duration)
+  * At (time)
+* Tasks:
+  * Built-in http request methods (get,post)
+  * Can invoke external commands (same as cron)
+    * Supports setting environments variable
+  * Can be configured to use any terminal/shell you want such as sh,bash,nu,cmd,powershell,...
+  * Can have retries per task (on commands exit-code !=0 or http request errors)
+* Support for hooks, for both when tasks fail or they finish successfully (structure is the same as a task)
+* Multiple scheduler for each job
+* Multiple task for each job
+* Logging:
+  * File logging
+  * ansi/plain/json log formatter