Bump version to PATCH release 1.5.1

Version 1.5.1 Release Notes:
- Fix buildLineItem parameters mixup
- Fix isRequestFromAssistant JSDoc return description
- Add linting rules for jsdoc and fix existing violations

Change-Id: I41c2a0f60d827dac5d51670ba15ff6f91f08b6d8

Bumps version to MINOR release 1.5.0

Version 1.5.0 Release Notes:
-Rename API.ai to Dialogflow

Change-Id: I959867d36bb09af6f7753e8aee1555896434b769

Bump version to MINOR release 1.4.0

Version 1.4.0 Release Notes:
-No input prompts sent with rich responses
-Add support for new NO_INPUT and CANCEL intents
-Add support for NEW_SURFACE intent

Change-Id: Ic5c1b1eef5547bf5ddeae4290bbd95f3651b5dc4

Bump version to PATCH release 1.3.1

Version 1.3.1 Release Notes:
- Bug fix for sublines in transactions
- Small JSDoc fixes

Change-Id: I5dd2e61f9005f8715208910099e69fc4df546b19

Bumps version to MINOR release 1.3.0

Bug: 65021060
Change-Id: I227b8d188b2a305a3394f687fb2b3be3c589560b

Bumping client version for next PATCH release\n Bug: 64076068

Change-Id: I27732116c06f53624866291dfc5f574af3c31d09

Bumping version to 1.2.0

Change-Id: I80d137bcfd9f98c3a02f0f96771b2a6a9bb720ed