Update googlebenchmark to 1.6.1 (#86)

diff --git a/cmake/DownloadGoogleBenchmark.cmake b/cmake/DownloadGoogleBenchmark.cmake
index 59da7a6..fd99d0e 100644
--- a/cmake/DownloadGoogleBenchmark.cmake
+++ b/cmake/DownloadGoogleBenchmark.cmake
@@ -4,8 +4,8 @@
 
 INCLUDE(ExternalProject)
 ExternalProject_Add(googlebenchmark
-	URL https://github.com/google/benchmark/archive/v1.2.0.zip
-	URL_HASH SHA256=cc463b28cb3701a35c0855fbcefb75b29068443f1952b64dd5f4f669272e95ea
+	URL https://github.com/google/benchmark/archive/v1.6.1.zip
+	URL_HASH SHA256=367e963b8620080aff8c831e24751852cffd1f74ea40f25d9cc1b667a9dd5e45
 	SOURCE_DIR "${CONFU_DEPENDENCIES_SOURCE_DIR}/googlebenchmark"
 	BINARY_DIR "${CONFU_DEPENDENCIES_BINARY_DIR}/googlebenchmark"
 	CONFIGURE_COMMAND ""