Update version to v1.1.5

PiperOrigin-RevId: 511732127
Change-Id: Id90190a4cd171762910937ae8dd46253e13b98d1

Author: tomwardio

RELEASE_NOTES.md

@@ -1,5 +1,11 @@
 # Release Notes
 
+## [1.1.5]
+
+*   Add optional `strict` argument to dictionary flattening.
+*   Relax flattening of create/join world settings, so that users can pass
+    already flattened settings.
+
 ## [1.1.4]
 
 *   Support for nested create/join world settings in `dm_env_adaptor` helper

dm_env_rpc/_version.py

@@ -17,4 +17,4 @@
 Kept in separate file so it can be used during installation.
 """
 
-__version__ = '1.1.4'  # https://www.python.org/dev/peps/pep-0440/
+__version__ = '1.1.5'  # https://www.python.org/dev/peps/pep-0440/