Merge branch 'v1.2.0' into 'master'

Update algorithms version to 1.2.0

See merge request !36

package.json

 {
   "name": "geomag-algorithms",
-  "version": "1.1.1",
+  "version": "1.2.0",
   "homepage": "http://geomag.usgs.gov/",
   "repository": "https://github.com/usgs/geomag-algorithms.git",
   "description": "Geomagnetism algorithms.",

setup.py

@@ -9,7 +9,7 @@ if ssl_cert_file:
 
 setuptools.setup(
     name="geomag-algorithms",
-    version="1.1.1",
+    version="1.2.0",
     description="USGS Geomag Algorithms Library",
     url="https://github.com/usgs/geomag-algorithms",
     packages=setuptools.find_packages(exclude=["test*"]),