fix(dsproof): Adding documentation

test/integration/chains/bchn/dsproof.js

@@ -2,6 +2,8 @@
   Integration tests for bchjs dsproof library.
 */
 
+const assert = require('chai').assert
+
 const BCHJS = require('../../../../src/bch-js')
 const bchjs = new BCHJS()
 
@@ -15,7 +17,9 @@ describe('#DSProof', () => {
       const txid =
         'ee0df780b58f6f24467605b2589c44c3a50fc849fb8f91b89669a4ae0d86bc7e'
       const result = await bchjs.DSProof.getDSProof(txid)
-      console.log(`result: ${JSON.stringify(result, null, 2)}`)
+      // console.log(`result: ${JSON.stringify(result, null, 2)}`)
+
+      assert.equal(result, null)
     })
   })
 })