1e1fb21c81
This patch puts the prost, prost-build, and prost-types dependencies together and unifies their version. This improves organization a bit in addition to improving build time slightly, since a redundant version of prost is now removed. The dependencies are _not_ updated to the newest versions, because the newest versions add a dependency on the `protoc` application, which is not provided by cargo and thus breaks the building process.