update guide for 1.7.0

UPDATE.md

@@ -1,3 +1,52 @@
+## 1.6.x -> 1.7.0
+pull the update: `git pull`  
+run `pip install -r requirements.txt` again to install newly required packages  
+make the following changes in your config.json file:
+```diff
+...
+	"instance": {
+		...
+	},
++	"accessibility": {
++		"font": "default",
++		"userway": {
++			"enabled": false,
++			"account": ""
++		}
++	},
+    "style": {
+		...
+		"homepageLayout": "...",
++		"navIcons": true,
++		"navIconsOnly": false
+    },
++	"antispam": {
++		"type": "basic",
++		"enabled": true,
++		"recaptcha": {
++			"sitekey": "",
++			"secretkey": ""
++		},
++		"turnstile": {
++			"sitekey": "",
++			"secretkey": ""
++		},
++		"frc": {
++			"sitekey": "",
++			"apikey": ""
++		}
++	},
+...
+```
+
+after that, log into your mariadb/mysql console and execute these commands:
+```
+USE <catask database name>;
+```
+```
+ALTER TABLE questions ADD COLUMN unread BOOLEAN NOT NULL DEFAULT TRUE;
+```
+
 ## 1.5.x -> 1.6.x
 
 pull the update: `git pull`