Update README.md

Fixes #14

Author: JanSlabon

README.md

@@ -1,38 +1,23 @@
-# Swisscom AIS signature module and batch functionality for the SetaPDF-Signer component
+# Swisscom AIS signature add-on for the SetaPDF-Signer component
 
-This package offers an individual module for the [SetaPDF-Signer Component](https://www.setasign.com/signer) that allows
-you to use the [Swisscom All-in Signing Service](https://trustservices.swisscom.com/signing-service/) 
-for the signature process of PDF documents. A big advantage of this module is, that it only transfers the hash, that 
-should be signed, to Swisscom AIS webservice and not the complete PDF document. The returned signature will be placed in
-the PDF document by the SetaPDF-Signer Component.
-
-Furthermore, this add-on comes with a batch class allowing to digital sign several documents with a single webservice
-call.
+This add-on offers individual signature modules and batch signature functionalities for the 
+[SetaPDF-Signer Component](https://www.setasign.com/signer) that allows you to use the [Swisscom All-in Signing Service](https://trustservices.swisscom.com/signing-service/)
+to digital **sign PDF documents in pure PHP**.
 
 The implementation is based on the [All-in Signing Service Reference Guide Version 2.10](https://documents.swisscom.com/product/1000255-Digital_Signing_Service/Documents/Reference_Guide/Reference_Guide-All-in-Signing-Service-en.pdf).
 
 The form for requesting a test account at Swisscom includes the Claimed IDs for testing and is available [here](https://documents.swisscom.com/product/filestore/lib/2c3229a1-3e50-4f3d-a957-ec1b55ade6dc/orderpermanenttestaccount-de.pdf).
 
 ## Requirements
-To use this package you need credentials for the Swisscom AIS webservice.
+To use this add-on you need credentials for the Swisscom AIS webservice.
 
-This package is developed and tested on PHP >= 7.1. Requirements of the [SetaPDF-Signer](https://www.setasign.com/signer)
+This add-on is developed and tested on PHP >= 7.2. Requirements of the [SetaPDF-Signer](https://www.setasign.com/signer)
 component can be found [here](https://manuals.setasign.com/setapdf-signer-manual/getting-started/#index-1).
 
 We're using [PSR-17 (HTTP Factories)](https://www.php-fig.org/psr/psr-17/) and [PSR-18 (HTTP Client)](https://www.php-fig.org/psr/psr-18/)
 for the requests. So you'll need an implementation of these. We recommend using Guzzle. Note: Your implementation must
 support client-side certificates.
 
-### For PHP 7.1
-```
-    "require" : {
-        "guzzlehttp/guzzle": "^6.5",
-        "http-interop/http-factory-guzzle": "^1.0",
-        "mjelamanov/psr18-guzzle": "^1.3"
-    }
-```
-
-### For >= PHP 7.2
 ```
     "require" : {
         "guzzlehttp/guzzle": "^7.0",