update NEWS for 1.1.5
update NEWS for 1.1.5

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