upgrade eslint plugins, turn off new rules, convert errors to warnings

package.json

@@ -65,16 +65,16 @@
     "@rollup/plugin-virtual": "^2.0.0",
     "@types/mocha": "^5.2.7",
     "@types/node": "^8.10.53",
-    "@typescript-eslint/eslint-plugin": "^1.13.0",
+    "@typescript-eslint/eslint-plugin": "^3.0.2",
-    "@typescript-eslint/parser": "^2.1.0",
+    "@typescript-eslint/parser": "^3.0.2",
     "acorn": "^7.1.0",
     "agadoo": "^1.1.0",
     "c8": "^5.0.1",
     "code-red": "0.1.1",
     "codecov": "^3.5.0",
     "css-tree": "1.0.0-alpha22",
-    "eslint": "^6.3.0",
+    "eslint": "^7.1.0",
-    "eslint-plugin-import": "^2.18.2",
+    "eslint-plugin-import": "^2.20.2",
     "eslint-plugin-svelte3": "^2.7.3",
     "estree-walker": "^1.0.0",
     "is-reference": "^1.1.4",

src/runtime/internal/Component.ts

@@ -19,7 +19,6 @@ interface Fragment {
 	/* outro   */ o: (local: any) => void;
 	/* destroy */ d: (detaching: 0|1) => void;
 }
-// eslint-disable-next-line @typescript-eslint/class-name-casing
 interface T$$ {
 	dirty: number[];
 	ctx: null|any;

src/runtime/store/index.ts

@@ -184,7 +184,7 @@ export function derived<T>(stores: Stores, fn: Function, initial_value?: T): Rea
 			},
 			() => {
 				pending |= (1 << i);
-			}),
+			})
 		);
 
 		inited = true;