chore(modules): rename entrypoint

Author: egorprnn

src/modules/index.ts

@@ -1,8 +1,8 @@
-export * from './Handler';
-export * from './Attachments';
-export * from './Keywords';
-export * from './Markdown';
-export * from './Message';
-export * from './Sender';
-export * from './VK';
-export * from './Storage';
+export * from './handler';
+export * from './attachments';
+export * from './keywords';
+export * from './markdown';
+export * from './message';
+export * from './sender';
+export * from './vk';
+export * from './storage';