docs(association): document uniqueKey for belongs to many (#12166)

docs/manual/core-concepts/assocs.md

@@ -308,6 +308,12 @@ CREATE TABLE IF NOT EXISTS "ActorMovies" (
 
 
 Unlike One-To-One and One-To-Many relationships, the defaults for both `ON UPDATE` and `ON DELETE` are `CASCADE` for Many-To-Many relationships.
 Unlike One-To-One and One-To-Many relationships, the defaults for both `ON UPDATE` and `ON DELETE` are `CASCADE` for Many-To-Many relationships.
 
 
+Belongs-To-Many creates a unique key when primary key is not present on through model. This unique key name can be overridden using **uniqueKey** option.
+
+```js
+Project.belongsToMany(User, { through: UserProjects, uniqueKey: 'my_custom_unique' })
+```
+
 ## Basics of queries involving associations
 ## Basics of queries involving associations
 
 
 With the basics of defining associations covered, we can look at queries involving associations. The most common queries on this matter are the *read* queries (i.e. SELECTs). Later on, other types of queries will be shown.
 With the basics of defining associations covered, we can look at queries involving associations. The most common queries on this matter are the *read* queries (i.e. SELECTs). Later on, other types of queries will be shown.

package.json

@@ -88,7 +88,7 @@
     "semantic-release": "^17.0.7",
     "semantic-release": "^17.0.7",
     "sinon": "^9.0.2",
     "sinon": "^9.0.2",
     "sinon-chai": "^3.3.0",
     "sinon-chai": "^3.3.0",
-    "sqlite3": "^4.0.6",
+    "sqlite3": "^4.1.1",
     "tedious": "6.0.0",
     "tedious": "6.0.0",
     "typescript": "^3.6.3"
     "typescript": "^3.6.3"
   },
   },