Bump version to 1.4.0 and update changelog for new features

[harshithad0703]

No description provided.

[github-actions]

Coverage report for commit: 2f9f2d2
File: coverage/clover.xml

Cover ┌─────────────────────────┐ Freq.
   0% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  10% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  20% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  30% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  40% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  50% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  60% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  70% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  80% │ ███████████████████████ │ 50.0%
  90% │ ████████░░░░░░░░░░░░░░░ │ 16.7%
 100% │ ████████████████░░░░░░░ │ 33.3%
      └─────────────────────────┘
 *Legend:* █ = Current Distribution 

Summary - Lines: 86.35% | Methods: 97.49% | Branches: 67.44%

Files	Lines	Methods	Branches
lib
contentstack.js	100.00%	100.00%	100.00%
contentstackClient.js	100.00%	100.00%	85.29%
contentstackCollection.js	86.67%	100.00%	90.00%
entity.js	75.31%	100.00%	53.45%
lib/core
Util.js	96.36%	100.00%	83.64%
concurrency-queue.js	90.40%	90.91%	83.74%
contentstackError.js	100.00%	100.00%	100.00%
contentstackHTTPClient.js	100.00%	100.00%	95.56%
region.js	100.00%	100.00%	75.00%
lib/marketplace/app/hosting
deployment.js	80.88%	100.00%	63.16%
index.js	80.00%	100.00%	58.23%
lib/marketplace/app
index.js	80.46%	90.00%	53.26%
lib/marketplace/app/oauth
index.js	83.33%	100.00%	52.63%
lib/marketplace/apprequest
index.js	82.86%	100.00%	58.54%
lib/marketplace/authorization
index.js	83.33%	100.00%	65.12%
lib/marketplace
index.js	90.48%	100.00%	82.76%
lib/marketplace/installation
index.js	81.82%	100.00%	56.52%
lib/marketplace/installation/webhooks
index.js	81.58%	100.00%	53.19%

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