updated project style guidelines

lib/api/mhsl/breaker/getBreakers/getBreakers.dart

@@ -9,13 +9,9 @@ class GetBreakers extends MhslApi<GetBreakersResponse> {
   GetBreakers() : super('breaker/');
 
   @override
-  GetBreakersResponse assemble(String raw) {
-    return GetBreakersResponse.fromJson(jsonDecode(raw));
-  }
+  GetBreakersResponse assemble(String raw) => GetBreakersResponse.fromJson(jsonDecode(raw));
 
   @override
-  Future<Response>? request(Uri uri) {
-    return http.get(uri);
-  }
+  Future<Response>? request(Uri uri) => http.get(uri);
 
-}
+}

lib/api/mhsl/breaker/getBreakers/getBreakersCache.dart

@@ -10,12 +10,8 @@ class GetBreakersCache extends RequestCache<GetBreakersResponse> {
   }
 
   @override
-  GetBreakersResponse onLocalData(String json) {
-    return GetBreakersResponse.fromJson(jsonDecode(json));
-  }
+  GetBreakersResponse onLocalData(String json) => GetBreakersResponse.fromJson(jsonDecode(json));
 
   @override
-  Future<GetBreakersResponse> onLoad() {
-    return GetBreakers().run();
-  }
-}
+  Future<GetBreakersResponse> onLoad() => GetBreakers().run();
+}

lib/api/mhsl/breaker/getBreakers/getBreakersResponse.dart

@@ -33,4 +33,4 @@ enum BreakerArea {
   @JsonValue('TALK') talk,
   @JsonValue('FILES') files,
   @JsonValue('MORE') more,
-}
+}