Fix typos (#43)

README.md

@@ -4,7 +4,7 @@
 
 ## What is Riverline\MultiPartParser
 
-``Riverline\MultiPartParse`` is a one class library to parse multipart document ( multipart email, multipart form, etc ...) 
+``Riverline\MultiPartParse`` is a one class library to parse multipart documents (multipart email, multipart form, etc ...) 
 and manage each part encoding and charset to extract their content.
 
 ## Requirements
@@ -81,7 +81,7 @@ if ($document->isMultiPart()) {
 
 ## Converters
 
-The libary also provide three converters to quickly parse `PSR-7`, `HttpFoundation` and native requests.
+The library also provides three converters to quickly parse `PSR-7`, `HttpFoundation` and native requests.
 
 ```php
 <?php
@@ -95,4 +95,4 @@ $document = Converters\Globals::convert();
 ## Backward compatibility
 
 The old `Part` parser is now deprecated and replaced with a wrapper class that create a temporary stream
-from the string content and call the new `StreamedPart` parser.
+from the string content and call the new `StreamedPart` parser.