Updated composer.json
Updated composer.json

 - updated license to MIT in line with license.txt
 - added support section
 - removed explicit version
 - loosened version requirement for composer/installers

See #50
aprendiendoando/timber,aprendiendoando/timber,joelgarciajr84/timber,Jmayhak/timber,PrisisForks/timber,aprendiendoando/timber,gchtr/timber,rpkoller/timber,mgmartel/timber,gbarberi/timber,lucasmichot/timber,xavierpriour/timber,aaemnnosttv/timber,joelgarciajr84/timber,lucasmichot/timber,jarednova/timber,aaemnnosttv/timber,blocher/timber,mgmartel/timber,pensesmart/timber,josephbergdoll/timber,rpkoller/timber,josephbergdoll/timber,pensesmart/timber,jarednova/timber,Jmayhak/timber,jnweaver/timber,ogrosko/timber,timber/timber,xavivars/timber,jnweaver/timber,xavierpriour/timber,blocher/timber,ogrosko/timber,anugupta/timber,ogrosko/timber,xavierpriour/timber,jarednova/timber,mojaray2k/timber,mgmartel/timber,gchtr/timber,PrisisForks/timber,rpkoller/timber,gchtr/timber,mojaray2k/timber,lucasmichot/timber,joelgarciajr84/timber,pensesmart/timber,aaemnnosttv/timber,xavivars/timber,Jmayhak/timber,PrisisForks/timber,anugupta/timber,gbarberi/timber,blocher/timber,anugupta/timber,gbarberi/timber,josephbergdoll/timber,mojaray2k/timber,xavivars/timber,timber/timber,jnweaver/timber