chore(release): 2.0.1-beta.93 [skip ci]

## [2.0.1-beta.93](https://github.com/PolymathNetwork/polymath-sdk/compare/v2.0.1-beta.92@beta...v2.0.1-beta.93@beta) (2020-01-14)

### Bug Fixes

* only transfer POLY to ST if the current balance is insufficient ([47e08cc](47e08cc))
* refine Launch Tiered STO types ([acd32aa](acd32aa))

### Features

* only transfer POLY to the ST if missing ([3cf8dbd](3cf8dbd))

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@polymathnetwork/sdk",
-  "version": "2.0.1-beta.92",
+  "version": "2.0.1-beta.93",
   "description": "A Javascript SDK for interacting with the Polymath network for the browser and Node.js",
   "bugs": {
     "url": "https://github.com/PolymathNetwork/polymath-sdk/issues"