Questions about branches and outdated links in README.md

[grif-on]

1. There are currently two branches : 2.1 and dev . Why is dev not a default branch , and why is it behind 2.1 ? What is the point of dev at all ?

2. What branch (or chechout ... or relative path) should be used for links in the documentation ? Right now readme has all kinds of links :

• https://github.com/axmolengine/axmol/blob/dev/AUTHORS.md Which are suffer from 1. problem .
• https://github.com/axmolengine/axmol/blob/d8d3137515a73e5c2395cae04d6b5ef6b1cc6777/CONTRIBUTING.md Which points to specific version of the file (and thus needs to be updated every time the target file changes) .
• https://github.com/axmolengine/axmol/blob/master/LICENSE Which points to a deleted branch (i.e. to page 404) , again 1. problem .
• extensions/README.md Which seems the most universal , since it is guaranteed to point to a file on any current branch . But feels like a double-edged sword due to this branch polymorphism .

[halx99]

The 2.1 branch is for 2.1.x releases, but current no break changes 2.2.x features commits on dev branch, the dev & 2.1 should be identically

[danialias]

Sorry, my bad. I made a new PR correcting those links. I think this issue can be closed now.

[grif-on]

The 2.1 branch is for 2.1.x releases, but current no break changes 2.2.x features commits on dev branch, the dev & 2.1 should be identically

Ok , get it . Sorry , i was just been confused since dev has been behind for a long time .

[grif-on]

Sorry, my bad. I made a new PR correcting those links. I think this issue can be closed now.

One more PR and yes , it should be closed .

[halx99]

Due to the dev & 2.1 is identically, I reset the default branch to dev