Advance version to 3.0

Advancing major version since command interface has changes (make-*
utility functions are now subcommands of cbmc-viewer).

Author: Mark R. Tuttle

setup.cfg

@@ -2,7 +2,7 @@
 
 [metadata]
 name = cbmc-viewer
-version = 2.14
+version = 3.0
 author = Mark R. Tuttle
 author_email = [email protected]
 description = CBMC viewer produces a browsable summary of CBMC findings

src/cbmc_viewer/version.py

@@ -4,7 +4,7 @@
 """Version number."""
 
 NAME = "CBMC viewer"
-NUMBER = "2.14"
+NUMBER = "3.0"
 VERSION = "{} {}".format(NAME, NUMBER)
 
 def version(display=False):

src/cbmc_viewer/viewer.py

@@ -9,7 +9,6 @@
 """
 
 from pathlib import Path
-import argparse
 import datetime
 import logging
 import os