Add reporter for Automake (#826)

This allows for integration with Automake's default log compiler.

See #826 for more details.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 605fce0..7ee391d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -210,6 +210,7 @@
 
 # Please keep these ordered alphabetically
 set(REPORTER_HEADERS
+        ${HEADER_DIR}/reporters/catch_reporter_automake.hpp
         ${HEADER_DIR}/reporters/catch_reporter_bases.hpp
         ${HEADER_DIR}/reporters/catch_reporter_compact.hpp
         ${HEADER_DIR}/reporters/catch_reporter_console.hpp