Change requirements for json writer:
treef0ca5c69533e2ffea1c6c5f21bf3ed7a8a64e1eb
-rw-r--r-- 426 .gitignore
-rw-r--r-- 1069 LICENSE
-rw-r--r-- 124 Makefile
-rw-r--r-- 71 README.md
drwxr-xr-x - doc
drwxr-xr-x - lib
drwxr-xr-x - src
drwxr-xr-x - test