Closes #935

* Update README.md

* Update README.md

According to the documentation, v5 is deprecated as of 12/2018. Update
it to v6 and also fix the link formatting (`-v5` previously redirected
to `/v5` but `-v6` does not redirect to `/v6`).

* add RIDB API(open data section)

* Update README.md

* Add Evil Insult Generator

* Update README.md

Dead link. Fixes issue #845.

Fixes issue #856.

The previous Link to the EPA went to a "not found" page.

One more free API

Modify URL

Place entry in alphabetical order

Add Age of Empires II API

* Adding Geocod.io to the Geocoding APIs list

* Update README.md

* added tfgm api

* fixed apiKey field error

* crypto apis

* tick fixes

* ICObench data api

Zloader API

Voltaire API

Coin Ranking API

* remove spacing in coin rank

* remove voltaire

* Added Zipcode API from zipcodeapi.com

* Added backtick for authentication field

* Update README.md

* Update README.md

* adding new item for security section

* Update README.md

* Addine AnimeNewsNetwork API

* Updating description of animenewsnetwork

* Update README.md

* Add in GeoJS to public APIs

* Update README.md

* adding geoplugin to the geocoding section

geoPlugin - the original and largest free IP geolocation web service API
geoplugin.com offers multiple geocoding APIs, including IP geolocation, currency conversion, reverse geocoding since 2004

We were the first free IP geolocation web service on the net and handle around 1/10 of the global traffic that google.com handles (live stats available on geoplugin.com)

All this for free (limit 120 requests a minute). 

No API key or registration required to use the API.

* Update README.md