Revert "Temporary delete payments API for 1.4.0 release."

This reverts commit d115ae1.

Signed-off-by: Sergey Minaev <[email protected]>

Author: jovfer

libindy/src/api/mod.rs

@@ -8,6 +8,7 @@ pub mod pool;
 pub mod did;
 pub mod wallet;
 pub mod blob_storage;
+pub mod payments;
 
 #[derive(Debug, PartialEq, Copy, Clone)]
 #[repr(i32)]