Update version to 21.08.00 in cmakelists (#410)

Bumps the version of cuSpatial in CMakeLists.txt.

Authors:
  - Mark Harris (https://github.com/harrism)

Approvers:
  - H. Thomson Comer (https://github.com/thomcom)

URL: #410

cpp/CMakeLists.txt

@@ -28,7 +28,7 @@ elseif(CMAKE_CUDA_ARCHITECTURES STREQUAL "")
   set(CUSPATIAL_BUILD_FOR_DETECTED_ARCHS TRUE)
 endif()
 
-project(CUSPATIAL VERSION 21.06.00 LANGUAGES C CXX)
+project(CUSPATIAL VERSION 21.08.00 LANGUAGES C CXX)
 
 # Needed because GoogleBenchmark changes the state of FindThreads.cmake,
 # causing subsequent runs to have different values for the `Threads::Threads` target.