Merge pull request #80 from thinksilicon/master

Update README.md to match signature validation.

Author: chrisjoyce911

README.md

@@ -44,8 +44,7 @@ This is hosted by a webserver and contains information about the latest firmware
     "version": 2,
     "host": "192.168.0.100",
     "port": 80,
-    "bin": "/fota/esp32-fota-http-2.bin",
-    "check_signature": true
+    "bin": "/fota/esp32-fota-http-2.bin"
 }
 ```
 
@@ -55,8 +54,7 @@ Version information can be either a single number or a semantic version string.
 {
     "type": "esp32-fota-http",
     "version": "2.5.1",
-    "url": "http://192.168.0.100/fota/esp32-fota-http-2.bin",
-    "check_signature": true
+    "url": "http://192.168.0.100/fota/esp32-fota-http-2.bin"
 }
 ```
 
@@ -124,7 +122,7 @@ void loop()
 You can now sign your firmware image with an RSA public/private key pair and have the ESP32 check if the signature is correct before
 it switches over to the new image.
 
-In order to use this feature, enable `check_signature` in `firmware.json`. Next create a key-pair to sign your firmware image:
+In order to use this feature just set the boolean `validate` to `true` in the constructor. Next create a key-pair to sign your firmware image:
 ```
 openssl genrsa -out priv_key.pem 4096
 openssl rsa -in priv_key.pem -pubout > rsa_key.pub
@@ -160,4 +158,4 @@ This relies on [semver.c by h2non](https://github.com/h2non/semver.c) for semant
 * @nuclearcat
 * @thinksilicon
 * @nuclearcat 
-* @hpsaturn 
+* @hpsaturn