Adding Picotainer to the list of implementations (#77)

Author: moufmouf

README.md

@@ -61,6 +61,7 @@ View open [request for comments](https://github.com/container-interop/container-
 - [Mouf](http://mouf-php.com)
 - [Njasm Container](https://github.com/njasm/container)
 - [PHP-DI](http://php-di.org)
+- [Picotainer](https://github.com/thecodingmachine/picotainer)
 - [PimpleInterop](https://github.com/moufmouf/pimple-interop)
 - [Pimple3-ContainerInterop](https://github.com/Sam-Burns/pimple3-containerinterop) (using Pimple v3)
 - [SitePoint Container](https://github.com/sitepoint/Container)
@@ -77,6 +78,7 @@ View open [request for comments](https://github.com/container-interop/container-
 - [InDI](https://github.com/idealogica/indi)
 - [League/Container](http://container.thephpleague.com/)
 - [Mouf](http://mouf-php.com)
+- [Picotainer](https://github.com/thecodingmachine/picotainer)
 - [PHP-DI](http://php-di.org)
 - [PimpleInterop](https://github.com/moufmouf/pimple-interop)
 - [Ultra-Lite Container](https://github.com/ultra-lite/container)