remove unneeded numpy import in iotools/tmy

* update what's new to explain that tmy3 dataframe now has original Date
  and Time columns used to parse the indices

Author: mikofski

docs/sphinx/source/whatsnew/v0.7.2.rst

@@ -3,6 +3,12 @@
 v0.7.2 (Month day, year)
 -------------------------
 
+Enhancements
+~~~~~~~~~~~~
+* TMY3 dataframe returned by :py:func:`~pvlib.iotools.read_tmy3` now contains
+  the original ``Date (MM/DD/YYYY)`` and ``Time (HH:MM)`` columns that the
+  indices were parsed from (:pull:`866`)
+
 Bug fixes
 ~~~~~~~~~
 * Fix :py:func:`~pvlib.iotools.read_tmy3` parsing when February contains

pvlib/iotools/tmy.py

@@ -6,7 +6,6 @@
 import io
 import re
 from urllib.request import urlopen, Request
-import numpy as np
 import pandas as pd