update README.md

- mention that Ctrl+C can be used to interrupt the REPL command (fixes #81)
- apply code syntax colors in README

Author: tanmaykm

README.md

@@ -59,7 +59,7 @@ using JuliaWebAPI   #Load package
 #Create the ZMQ client that talks to the ZMQ listener above
 const apiclnt = APIInvoker("tcp://127.0.0.1:9999");
 
-#Starts the HTTP server in current process
+#Start the HTTP server in current process (Ctrl+C to interrupt)
 run_http(apiclnt, 8888)
 ```
 
@@ -71,12 +71,12 @@ This will return the following JSON response to your browser, which is the resul
 
 Example of an authentication filter implemented using a pre-processor:
 
-````
+```julia
 function auth_preproc(req::HTTP.Request)
     if !validate(req)
         return HTTP.Response(401)
     end
     return nothing
 end
 run_http(apiclnt, 8888, auth_preproc)
-````
+```