Update Protobuf version to >=3.0.0 in requirements

Author: nmariz

README.txt

@@ -11,7 +11,7 @@ License information can be found in the LICENSE.txt file.
 Requirements
 ============
 
-Protobuf C++ (version >= 2.6.0) and Python Protobuf (version >= 3.0.0)
+Protobuf C++ (version >= 3.0.0) and Python Protobuf (version >= 3.0.0)
 https://developers.google.com/protocol-buffers/docs/downloads
 
 

docs/mysqlx/requirements.rst

@@ -5,4 +5,5 @@ Requirements
 * Python 2.7 or >= 3.4
 * Protobuf C++ (version >= 3.0.0)
 * Python Protobuf (version >= 3.0.0)
-* dnspython (version >= 1.16.0)
+* dnspython (version >= 1.16.0) for DNS SRV support
+* lz4 (version >= 2.1.6) for connection compression