Update CHANGELOG.md

Merge pull request #97 from storyblok/feature/INT-1119

Update readme with new regions.

Merge pull request #91 from storyblok/feature/int-979

INT-979 Added agent headers to every request

Merge pull request #87 from storyblok/fix/INT-859-level

Fix/int 859 level

Merge pull request #82 from axkirillov/patch-1

fix typo

Merge pull request #69 from roberto-butti/master

Update README.md

Merge pull request #59 from storyblok/docs/INT-531-update-readme

docs(INT-531): update readme to us region

Merge pull request #41 from storyblok/feature/ssl-param-mapi

Feature/ssl param mapi

Merge pull request #27 from lucadegasperi/master

Add support for i18n content retrieval

Merge pull request #31 from storyblok/feature/api-v2

Feature/api v2