release_notes.md in appium_lib-10.3.1 vs release_notes.md in appium_lib-10.4.0

@@ -1,4 +1,12 @@
+#### v10.4.0 2019-07-19
+
+- [954a3a8](https://github.com/appium/ruby_lib/commit/954a3a8d4d5cd56fa5a4e80d021805759dbf5e10) Release 10.4.0
+- [8289c9f](https://github.com/appium/ruby_lib/commit/8289c9f8e19fab754538f229e1a5513e2994dba3) fix warning message in driver detection (#864)
+- [5e61241](https://github.com/appium/ruby_lib/commit/5e612419ccd4dc5f5bd8b657a972cce4113bf9e7) update core 3.2 (#863)
+- [1f58984](https://github.com/appium/ruby_lib/commit/1f5898400dd1928bfe42ddd5f842d1f8738f2f76) Update readme.md (#861)
+
+
 #### v10.3.1 2019-04-11
 
 - [ef89749](https://github.com/appium/ruby_lib/commit/ef89749d25c7044fe27fa4b7c1adfd011b60bba1) Release 10.3.1
 - [d90f149](https://github.com/appium/ruby_lib/commit/d90f1499f6c7f5c8222f7915d60c7a7218d43949) remove ';' to avoid 'Unclosed paren in expression' (#859)
 
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