added Catch2 to Attributions section in README

Author: The-EDev

README.md

@@ -135,6 +135,8 @@ Crow has incorporated the following libraries into its source.
     FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
     IN THE SOFTWARE. 
 
+    ---------------------------------------------------------------------------
+    
 
     qs_parse (used for reading query string parameters)
 
@@ -150,6 +152,8 @@ Crow has incorporated the following libraries into its source.
     The above copyright notice and this permission notice shall be included in
     all copies or substantial portions of the Software.
 
+    ---------------------------------------------------------------------------
+    
 
     TinySHA1 (used during the websocket handshake, not for security)
 
@@ -169,3 +173,34 @@ Crow has incorporated the following libraries into its source.
     LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
     OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
     PERFORMANCE OF THIS SOFTWARE.
+    
+    ---------------------------------------------------------------------------
+    
+    
+    Catch2 (used only in unit tests, not part of the actual framework)
+    
+    https://github.com/catchorg/Catch2
+    
+    Boost Software License - Version 1.0 - August 17th, 2003
+
+    Permission is hereby granted, free of charge, to any person or organization
+    obtaining a copy of the software and accompanying documentation covered by
+    this license (the "Software") to use, reproduce, display, distribute,
+    execute, and transmit the Software, and to prepare derivative works of the
+    Software, and to permit third-parties to whom the Software is furnished to
+    do so, all subject to the following:
+
+    The copyright notices in the Software and this entire statement, including
+    the above license grant, this restriction and the following disclaimer,
+    must be included in all copies of the Software, in whole or in part, and
+    all derivative works of the Software, unless such copies or derivative
+    works are solely in the form of machine-executable object code generated by
+    a source language processor.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+    SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+    FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+    ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+    DEALINGS IN THE SOFTWARE.