CDRIVER-531 Correct libbson_required_version to 1.1.0

Author: TylerBrock

build/autotools/Versions.m4

@@ -12,6 +12,6 @@ m4_define([lt_current], [m4_eval(100 * mongoc_minor_version + mongoc_micro_versi
 m4_define([lt_revision], [mongoc_interface_age])
 m4_define([lt_age], [m4_eval(mongoc_binary_age - mongoc_interface_age)])
 
-m4_define([libbson_required_version], [1.1.1])
+m4_define([libbson_required_version], [1.1.0])
 
 m4_define([sasl_required_version], [2.1.6])