REAMDE: update supported platforms.
REAMDE: update supported platforms.

remicollet/libbson,Convey-Compliance/libbson,bjori/libbson,mapr/libbson,mongodb/libbson,Convey-Compliance/libbson,paulmelnikow/libbson,rcsanchez97/libbson,alexeyvo/libbson,rcsanchez97/libbson,alexeyvo/libbson,alexeyvo/libbson,mongodbinc-interns/libbson,jqk6/libbson,jqk6/libbson,rcsanchez97/libbson,ajdavis/libbson,derickr/libbson,rayyang2000/libbson,paulmelnikow/libbson,mapr/libbson,rayyang2000/libbson,ksuarz/libbson,rayyang2000/libbson,derickr/libbson,Machyne/libbson,ksuarz/libbson,4Second2None/libbson_tmp,4Second2None/libbson_tmp,bjori/libbson,paulmelnikow/libbson,rayyang2000/libbson,ajdavis/libbson,remicollet/libbson,mongodbinc-interns/libbson,Convey-Compliance/libbson,4Second2None/libbson_tmp,mapr/libbson,Machyne/libbson,remicollet/libbson,ajdavis/libbson,Machyne/libbson,derickr/libbson,mongodbinc-interns/libbson,bjori/libbson,paulmelnikow/libbson,mongodb/libbson,jqk6/libbson,derickr/libbson,remicollet/libbson,mongodbinc-interns/libbson,ksuarz/libbson,mongodb/libbson,paulmelnikow/libbson,Machyne/libbson,4Second2None/libbson_tmp,jqk6/libbson