add upgrade procedure

readme.md

@@ -194,3 +194,25 @@ $ sudo systemctl reload ssh
 ```
 
 Create user in Gitea to access Gitea
+
+
+## Upgrade gitea
+* stop current gitea running instance
+* download latest binary
+
+```
+# login to pi user
+
+$ wget -O gitea https://dl.gitea.io/gitea/1.12.1/gitea-1.12.1-linux-arm-6
+$ chmod +x gitea
+
+$ sudo cp gitea /home/git
+
+```
+
+* restart gitea service
+
+```
+$ sudo su - git
+$./gitea web
+```