Merge pull request #53 from algorand/fix131

-- Fix 1.3.1 build

Author: algorotem

.travis.yml

@@ -1,10 +1,11 @@
 language: node_js
 node_js:
-  - "9"
+  - "12"
 
 install:
   - curl https://raw.githubusercontent.com/algorand/algorand-sdk-testing/master/scripts/sdkupdate.sh -o ~/sdkupdate.sh
   - chmod +x ~/sdkupdate.sh
+  - npm install
 
 script:
   - npm test

src/client/kmd.js

@@ -256,7 +256,7 @@ function Kmd(token, baseServer = "http://127.0.0.1", port = 7833) {
         let req = {
             "wallet_handle_token": walletHandle,
             "wallet_password": walletPassword,
-            "transaction": tx.toByte().toString('base64')
+            "transaction": Buffer.from(tx.toByte()).toString('base64')
         };
         let res = await c.post("/v1/transaction/sign", req);
 
@@ -342,7 +342,7 @@ function Kmd(token, baseServer = "http://127.0.0.1", port = 7833) {
         let tx = new txn.Transaction(transaction);
         let req = {
             "wallet_handle_token": walletHandle,
-            "transaction": tx.toByte().toString('base64'),
+            "transaction": Buffer.from(tx.toByte()).toString('base64'),
             "public_key": Buffer.from(pk).toString('base64'),
             "partial_multisig": partial,
             "wallet_password": pw