Require cmake>=3.1
Plus some other build-related changes. I don't think there is anything
functionally different from 1.7.7, or even any binary incompatibilities, but
the cmake change is significant.
diff --git a/include/json/version.h b/include/json/version.h
index 24e2b09..9e5a66e 100644
--- a/include/json/version.h
+++ b/include/json/version.h
@@ -3,10 +3,10 @@
#ifndef JSON_VERSION_H_INCLUDED
# define JSON_VERSION_H_INCLUDED
-# define JSONCPP_VERSION_STRING "1.7.7"
+# define JSONCPP_VERSION_STRING "1.8.0"
# define JSONCPP_VERSION_MAJOR 1
-# define JSONCPP_VERSION_MINOR 7
-# define JSONCPP_VERSION_PATCH 7
+# define JSONCPP_VERSION_MINOR 8
+# define JSONCPP_VERSION_PATCH 0
# define JSONCPP_VERSION_QUALIFIER
# define JSONCPP_VERSION_HEXA ((JSONCPP_VERSION_MAJOR << 24) | (JSONCPP_VERSION_MINOR << 16) | (JSONCPP_VERSION_PATCH << 8))