Minor Readme Changes

Added Logistic as a viable activation you can use.
Added conf-thresh as the 7th parameter in the ./demo call.

README.md

@@ -195,6 +195,7 @@ All models from darknet are now parsed directly from cfg, you still need to expo
   relu
   leaky
   mish
+  logistic
 </details>
 
 ## Run the demo 
@@ -217,7 +218,7 @@ Once you have successfully created your rt file, run the demo:
 ```
 In general the demo program takes 7 parameters:
 ```
-./demo <network-rt-file> <path-to-video> <kind-of-network> <number-of-classes> <n-batches> <show-flag>
+./demo <network-rt-file> <path-to-video> <kind-of-network> <number-of-classes> <n-batches> <show-flag> <conf-thresh>
 ```
 where
 *  ```<network-rt-file>``` is the rt file generated by a test