Version 2.1 is no longer compatible with Carthage

[matthewdovey]

On checking out version 2.1 and attempting to build my app I am seeing multiple errors regarding the imported header files.

/<module-includes>:1:1: Umbrella header for module 'JLRoutes' does not include header 'JLRRouteRequest.h'
/<module-includes>:1:1: Umbrella header for module 'JLRoutes' does not include header 'JLRRouteResponse.h'
/<module-includes>:1:1: Umbrella header for module 'JLRoutes' does not include header 'JLRRouteHandler.h'
/<module-includes>:1:1: Umbrella header for module 'JLRoutes' does not include header 'JLRRouteDefinition.h'