Update CHANGELOG (#177)

Co-authored-by: noi narisak <noi.narisak@users.noreply.github.com>

CHANGELOG.md

@@ -1,4 +1,17 @@
-## 3.5.0 (Unreleased)
+## 3.6.0 (Unreleased)
+
+## 3.5.0 (August 31, 2020)
+
+ENHANCEMENTS:
+
+* Add password import inline hook type. [#168](https://github.com/oktadeveloper/terraform-provider-okta/pull/168), Thanks, [@noinarisak](https://github.com/noinarisak) aka me! :tada:
+* Add external_namespace property for app_user_schema and user_schema. [#102](https://github.com/oktadeveloper/terraform-provider-okta/pull/102), Thanks, [@thehunt33r](https://github.com/thehunt33r)!
+
+BUGS:
+
+* Fix inline hook example code to match version that is supported. [#175](https://github.com/oktadeveloper/terraform-provider-okta/pull/175), Thanks, [@noinarisak](https://github.com/noinarisak) me again! :smiley:
+* Update app_group_assignment.html.markdown. [#165](https://github.com/oktadeveloper/terraform-provider-okta/pull/165), Thanks, [snolan-amount](https://github.com/snolan-amount)!
+
 
 ## 3.4.1 (July 31, 2020)