add libgit2 to licensing info
add libgit2 to licensing info

Vector35/binaryninja-api,Vector35/binaryninja-api,joshwatson/binaryninja-api,joshwatson/binaryninja-api,Vector35/binaryninja-api,joshwatson/binaryninja-api,Vector35/binaryninja-api,Vector35/binaryninja-api,joshwatson/binaryninja-api,joshwatson/binaryninja-api,Vector35/binaryninja-api,Vector35/binaryninja-api