update python changelog (#2522)

Author: Dev-Khant

docs/changelog/overview.mdx

@@ -6,6 +6,25 @@ mode: "wide"
 <Tabs>
 <Tab title="Python">
 
+<Update label="2025-04-09" description="v0.1.87">
+
+**New Features:**
+- **Upstash Vector:** Added support for Upstash Vector store
+
+**Improvements:**
+- **Code Quality:** Removed redundant code lines
+- **Build:** Updated MAKEFILE
+- **Documentation:** Updated memory export documentation
+
+</Update>
+
+<Update label="2025-04-07" description="v0.1.86">
+
+**Improvements:**
+- **FAISS:** Added embedding_dims parameter to FAISS vector store
+
+</Update>
+
 <Update label="2025-04-07" description="v0.1.84">
 
 **New Features:**