Add build:watch to README's

README.md

@@ -81,6 +81,12 @@ Build all packages
 yarn lerna:run build
 ```
 
+Continuously rebuild on exchange
+
+```bash
+yarn dev
+```
+
 ### Lint
 
 Lint all packages

package.json

@@ -3,6 +3,7 @@
     "name": "0x.js",
     "workspaces": ["packages/*"],
     "scripts": {
+        "dev": "lerna run --parallel build:watch",
         "testrpc": "testrpc -p 8545 --networkId 50 -m \"${npm_package_config_mnemonic}\"",
         "prettier": "prettier --write '**/*.{ts,tsx,json,md}' --config .prettierrc",
         "prettier:ci": "prettier --list-different '**/*.{ts,tsx,json,md}' --config .prettierrc",

packages/contracts/README.md

@@ -38,6 +38,12 @@ yarn install
 yarn build
 ```
 
+or
+
+```bash
+yarn build:watch
+```
+
 ### Clean
 
 ```bash

packages/deployer/README.md

@@ -60,6 +60,12 @@ yarn install
 yarn build
 ```
 
+or
+
+```bash
+yarn build:watch
+```
+
 ### Lint
 
 ```bash

packages/json-schemas/README.md

@@ -49,6 +49,12 @@ yarn install
 yarn build
 ```
 
+or
+
+```bash
+yarn build:watch
+```
+
 ### Lint
 
 ```bash

packages/monorepo-scripts/README.md

@@ -40,6 +40,12 @@ yarn install
 yarn build
 ```
 
+or
+
+```bash
+yarn build:watch
+```
+
 ### Clean
 
 ```bash

packages/subproviders/README.md

@@ -64,6 +64,12 @@ yarn install
 yarn build
 ```
 
+or
+
+```bash
+yarn build:watch
+```
+
 ### Clean
 
 ```bash

packages/tslint-config/README.md

@@ -44,6 +44,12 @@ yarn install
 yarn build
 ```
 
+or
+
+```bash
+yarn build:watch
+```
+
 ### Lint
 
 ```bash

packages/types/README.md

@@ -40,6 +40,12 @@ yarn install
 yarn build
 ```
 
+or
+
+```bash
+yarn build:watch
+```
+
 ### Lint
 
 ```bash

packages/utils/README.md

@@ -40,6 +40,12 @@ yarn install
 yarn build
 ```
 
+or
+
+```bash
+yarn build:watch
+```
+
 ### Lint
 
 ```bash

packages/web3-wrapper/README.md

@@ -44,6 +44,12 @@ yarn install
 yarn build
 ```
 
+or
+
+```bash
+yarn build:watch
+```
+
 ### Lint
 
 ```bash