pip replaced with pip2 in installation instruction

Signed-off-by: mlabenski <[email protected]>

Author: mlabenski

.gitignore

@@ -1,3 +1,8 @@
 docs/build
 .vscode
 docs2
+build
+dist
+__pycache__
+nzpyida.egg-info
+.DS_Store

docs/source/install.rst

@@ -4,16 +4,16 @@ Install
 Installing
 ----------
 
-Install nzpyida from pip by issuing this statement::
+Install nzpyida from pip3 by issuing this statement::
 
-	> pip install nzpyida
+	> pip3 install nzpyida
 
 Updating
 --------
 
 To update your nzpyida installation, issue this statement::
 
-	> pip install nzpyida --update --no-deps
+	> pip3 install nzpyida --update --no-deps
 
 Ensure you have INZA version 11.2.1.0 or later installed in your Netezza database.