documentation: Bump version

docs/changelog.md

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+#### 1.13.0-alpha.10
+
+* Improve kTLS support **1**
+* Fixes and improvements
+
+**1**:
+
+kTLS is now compatible with custom TLS implementations other than uTLS.
+
 #### 1.13.0-alpha.9
 
 * Add kTLS support **1**