Update README.md

[werenall]

:count is placed in (-> fsm ::tk/process) and not fsm itself.

Without the change:

(->> ["abaaabc" "aaacb" "bbbcab"]
     (map (partial reduce tk/apply-signal count-ab))
     (map :count))

Error printing return value (NullPointerException) at clojure.lang.Numbers/ops (Numbers.java:1095).
Cannot invoke "Object.getClass()" because "x" is null