Fix syntax of postgres update queries

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@extollo/lib",
-  "version": "0.9.49",
+  "version": "0.9.50",
   "description": "The framework library that lifts up your code.",
   "main": "lib/index.js",
   "types": "lib/index.d.ts",

src/orm/dialect/PostgreSQLDialect.ts

@@ -335,7 +335,7 @@ export class PostgreSQLDialect extends SQLDialect {
             sets.push(`  "${key}" = ${this.escape(data[key])}`)
         }
 
-        return ['SET', ...sets].join('\n')
+        return `SET\n${sets.join(',\n')}`
     }
 
     public renderCreateTable(builder: TableBuilder): string {