docs: clarify upgrade instructions for pre and post v1.1.18 users

Author: doITmagic

README.md

@@ -76,13 +76,20 @@ Invoke-WebRequest -Uri "https://github.com/doITmagic/rag-code-mcp/releases/lates
 
 ### 🔄 Keep Updated
 
-RagCode now includes a self-update mechanism.
+The auto-update feature is available starting with **v1.1.18**.
 
-**For existing users (Upgrade):**
-```bash
-# If you installed using the method above (v1.1.18+):
-rag-code-mcp --update
-```
+**How to Upgrade:**
+
+1.  **If you are on an older version (< v1.1.18):**
+    Your version **does not know** the update command.
+    You must **re-run the installation command** (the curl command above) one last time.
+    *(Don't worry, your indexes and configuration will be preserved).*
+
+2.  **If you are on v1.1.18 or newer:**
+    Simply run:
+    ```bash
+    rag-code-mcp --update
+    ```
 
 **For new installations:**
 The update system is built-in. Use the installer once, then simply run `rag-code-mcp --update` anytime to get the latest features.

go.mod

@@ -3,6 +3,7 @@ module github.com/doITmagic/rag-code-mcp
 go 1.24.4
 
 require (
+	github.com/Masterminds/semver/v3 v3.4.0
 	github.com/PuerkitoBio/goquery v1.10.0
 	github.com/VKCOM/php-parser v0.8.2
 	github.com/fsnotify/fsnotify v1.9.0
@@ -15,7 +16,6 @@ require (
 )
 
 require (
-	github.com/Masterminds/semver/v3 v3.4.0 // indirect
 	github.com/andybalholm/cascadia v1.3.2 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/dlclark/regexp2 v1.10.0 // indirect

go.sum

@@ -1,5 +1,3 @@
-github.com/Masterminds/semver v1.5.0 h1:H65muMkzWKEuNDnfl9d70GUjFniHKHRbFPGBuZ3QEww=
-github.com/Masterminds/semver v1.5.0/go.mod h1:MB6lktGJrhw8PrUyiEoblNEGEQ+RzHPF078ddwwvV3Y=
 github.com/Masterminds/semver/v3 v3.4.0 h1:Zog+i5UMtVoCU8oKka5P7i9q9HgrJeGzI9SA1Xbatp0=
 github.com/Masterminds/semver/v3 v3.4.0/go.mod h1:4V+yj/TJE1HU9XfppCwVMZq3I84lprf4nC11bSS5beM=
 github.com/PuerkitoBio/goquery v1.10.0 h1:6fiXdLuUvYs2OJSvNRqlNPoBm6YABE226xrbavY5Wv4=