Add method to get gas price in util

src/util.ts

@@ -2,7 +2,7 @@ import * as Block from 'multiformats/block';
 import { sha256 as hasher } from 'multiformats/hashes/sha2';
 import assert from 'assert';
 
-import { StdFee, parseCoins } from '@cosmjs/stargate';
+import { GasPrice, StdFee, parseCoins } from '@cosmjs/stargate';
 import * as dagCBOR from '@ipld/dag-cbor';
 import * as dagJSON from '@ipld/dag-json';
 
@@ -143,4 +143,12 @@ export class Util {
       gas: String(gas)
     };
   }
+
+  /**
+   * Get gas price in proper format
+   */
+  static getGasPrice (gasPrice: string | null): GasPrice | undefined {
+    const gasPriceString = gasPrice;
+    return gasPriceString != null ? GasPrice.fromString(String(gasPriceString)) : undefined;
+  }
 }