update to the latest annoy module

It appears that the new Annoy module has addressed the memory leak issue.

This release is to implement that fix.

1.1.3 release

fix bugs

1.1.2 release

• adding a new function to get nearest neighbor by a vector

1.1.1 release

• adding missing file to make the release useful

1.1.0 release

• adding serving embeddings directly
• reorganize the code structure to follow the standard golang project.

first release

1.0.0

use updated interface