Merge pull request #101 from mgalimullin/update_version_gtest

updated version gtest in conanfile 1.7.0 -> 1.8.0

Author: khizmax

conanfile.txt

@@ -1,5 +1,5 @@
 [requires]
-gtest/1.7.0@lasote/stable
+gtest/1.8.0@lasote/stable
 Boost/1.60.0@lasote/stable
 
 [options]