fix: loader report minimum number of signatures required (#535)

web3.js/src/bpf-loader.js

@@ -16,6 +16,16 @@ export class BpfLoader {
     return new PublicKey('BPFLoader1111111111111111111111111111111111');
   }
 
+  /**
+   * Minimum number of signatures required to load a program not including
+   * retries
+   *
+   * Can be used to calculate transaction fees
+   */
+  static getMinNumSignatures(dataLength: number): number {
+    return Loader.getMinNumSignatures(dataLength);
+  }
+
   /**
    * Load a BPF program
    *