fix: Add annotations to documentation

Author: tkyi

README.md

@@ -29,9 +29,10 @@ npm install screwdriver-executor-base
 | Parameter        | Type  |  Description |
 | :-------------   | :---- | :-------------|
 | config        | Object | Configuration Object |
+| config.annotations | Object | Optional key/value object |
+| config.apiUri | String | Screwdriver's API |
 | config.buildId | String | The unique ID for a build |
 | config.container | String | Container for the build to run in |
-| config.apiUri | String | Screwdriver's API |
 | config.token | String | JWT to act on behalf of the build |
 
 ##### Expected Outcome

index.js

@@ -37,9 +37,10 @@ class Executor {
      * Start a new build
      * @method start
      * @param {Object} config               Configuration
+     * @param {Object} [config.annotations] Optional key/value object
+     * @param {String} config.apiUri        Screwdriver's API
      * @param {String} config.buildId       Unique ID for a build
      * @param {String} config.container     Container for the build to run in
-     * @param {String} config.apiUri        Screwdriver's API
      * @param {String} config.token         JWT to act on behalf of the build
      * @return {Promise}
      */