Update what's new file.

Add bullet point about added tests for bifacial.py methods.

Author: alexandermorgan

docs/sphinx/source/whatsnew/v0.7.0.rst

@@ -7,12 +7,15 @@ This is a major release that drops support for Python 2 and Python 3.4. We
 recommend all users of v0.6.3 upgrade to this release after checking API
 compatibility notes.
 
-**Python 2.7 support ended on June 1, 2019**. (:issue:`501`)
+**Python 2.7 support ended on June 1, 2019.** (:issue:`501`)
 
 **Minimum numpy version is now 1.10.4. Minimum pandas version is now 0.18.1.**
 
+**Adds tests for methods in bifacial.py.**
+
 
 Contributors
 ~~~~~~~~~~~~
 * Mark Campanellli (:ghuser:`markcampanelli`)
 * Will Holmgren (:ghuser:`wholmgren`)
+* Alexander Morgan (:ghuser:`alexandermorgan`)