Update doc to reflect removal of support for Python 2.x

Author: gmfeinberg

README-DEV.rst

@@ -6,12 +6,15 @@ This document is for developers of the Python SDK for the Oracle NoSQL Database.
 Developers are those who need to modify source and examples, build and run tests
 and examples, and build documentation.
 
+Use of "python" below may be "python3" depending on your machine
+configuration. Python 3 is required.
+
 ===============
 Getting Started
 ===============
 Clone the repository and Install dependencies.
 
-1. Make sure that Python is installed on your system, at least version 2.7.
+1. Make sure that Python is installed on your system, at least version 3.5.
 2. Install pip if it is not installed, follow the `pip installation instructions
    <https://pip.pypa.io/en/stable/installing>`_.
 3. Clone the repository and install development dependencies::

docs/index.rst

@@ -2,7 +2,7 @@
 Oracle NoSQL Database Python SDK - |NoSQLSdkVersion|
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-This is the Python SDK for the Oracle NoSQL Database. Python 2.7+ and 3.5+ are
+This is the Python SDK for the Oracle NoSQL Database. Python 3.5+ is
 supported.
 
 For information about the Oracle NoSQL Database see

docs/installation.rst

@@ -17,7 +17,7 @@ Database Python SDK. There are several supported environments:
 
 The Python SDK requires:
 
-* Python version 2.7.5 or 3.5 or later, running on Mac, Windows, or Linux.
+* Python version 3.5 or later, running on Mac, Windows, or Linux.
 * For the Oracle NoSQL Cloud Service:
 
   * An Oracle Cloud Infrastructure account