Add clang-format to the list of dev requirements

README.md

@@ -14,8 +14,9 @@ Below is a high-level overview of the project structure and capabilities we are
 * HDF5
 * Boost
 * Doxygen (optional, documentation building is skipped if missing)
-* cppcheck (optional, only needed when building in developer mode `dev`)
-
+* Additional requirements for developers (mode `dev`)
+    * cppcheck
+    * clang-format
 
 # Building and installing