Update README.md

README.md

@@ -1,6 +1,8 @@
 ###Crawler Detector
 Fat-free and fast web crawler (bot) detector
 
+Special thanks for [Piwik team](http://piwik.org/team/) for the [crawlers regexes](https://github.com/piwik/device-detector/blob/master/regexes/bots.yml) :heart:
+
 ###Usage
 ```
 $ composer require macsch15/crawler-detector dev-master
@@ -35,4 +37,4 @@ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
+THE SOFTWARE.