* Add SpaceTradersAPI

-[x] My submission is formatted according to the guidelines in the contributing guide
-[x] My addition is ordered alphabetically
-[x] My submission has a useful description
-[x] The description does not end with punctuation
-[x] Each table column is padded with one space on either side
-[x] I have searched the repository for any relevant issues or pull requests
-[x] Any category I am creating has the minimum requirement of 3 items
-[x] All changes have been squashed into a single commit

Added Imgflip api

Added Sentiment Analysis Api to Text Analysis

I removed the required lines

Make CONTRIBUTING.md more precise and clear.

Note: The PR #1085 is inative.

Resolve #1085

Adds RuneScape API

Add kroki.io

🐕 Added place.dog to animals section

Added 4chan

Add NLP Cloud

Revert "Added Unixtime conversion service"

Added Unixtime conversion service

Added Thirukkural API in Books category

Resolve #1660

As reported in #1660

Added troposphere.io weather API

Revert "Add NLP Cloud API"

Add NLP Cloud API

Add Shikimory

Update README.md

Update README.md

Remove duplicate weatherstack entry.

 Only leave it in the Weather section.

Squash commits.