Bump version to 1.89.2

Somewhat reluctant to do this, but it's a pretty major bug.

gradle.properties

@@ -1,5 +1,5 @@
 # Mod properties
-mod_version=1.89.1
+mod_version=1.89.2
 
 # Minecraft properties
 mc_version=1.12.2

src/main/resources/assets/computercraft/lua/rom/help/changelog.txt

@@ -1,3 +1,7 @@
+# New features in CC: Tweaked 1.89.2
+
+* Fix dupe bug when killing an entity with a turtle.
+
 # New features in CC: Tweaked 1.89.1
 
 * Fix crashes when rendering monitors of varying sizes.

src/main/resources/assets/computercraft/lua/rom/help/whatsnew.txt

@@ -1,5 +1,5 @@
-New features in CC: Tweaked 1.89.1
+New features in CC: Tweaked 1.89.2
 
-* Fix crashes when rendering monitors of varying sizes.
+* Fix dupe bug when killing an entity with a turtle.
 
 Type "help changelog" to see the full version history.