README update for 1.4.8

Author: nickmaccarthy

README.md

@@ -114,7 +114,7 @@ datetime.datetime(2016, 1, 22, 22, 58, 28, 338060, tzinfo=tzutc())
 datetime.datetime(2016, 1, 24, 22, 57, 45, 394470, tzinfo=tzutc())
 ```
 
-Or you can just import the `datamath` module, this will always give us a native `datetime` object
+Or you can just import the `datemath` module, this will always give us a native `datetime` object
 ```
 >>> from datemath import datemath
 >>>
@@ -153,9 +153,10 @@ from datemath import dm
 ```
 
 # Release Notes
-* v1.4.8 - Fixed regressions in `arrow()`, migrated from `replace()` to `shift()`.  Added python2 and python3 requirements and tests.  Modifed `helpers.py` to support `replace()` for legacy 2.7, and `shift()` for python 3+
-* v1.4.7 - Fixed timezone for date strings: https://github.com/nickmaccarthy/python-datemath/issues/6     
-* v1.4.5 - Added roundDown functionality.  Allows user to specify the default rounding for expressions such as `/d`.
+* `v1.4.8` - Fixed regressions in `arrow()`, migrated from `replace()` to `shift()`.  Added python2 and python3 requirements and tests.  Modifed `helpers.py` to support `replace()` for legacy 2.7, and `shift()` for python 3.7.  Only python `2.7` and `3.7+` are supported going forward.  In a future version, only `3.7+` will be supported.  
+
+* `v1.4.7` - Fixed timezone for date strings: https://github.com/nickmaccarthy/python-datemath/issues/6     
+* `v1.4.5` - Added roundDown functionality.  Allows user to specify the default rounding for expressions such as `/d`.
     * example - assuming the time is currently 2016-01-01 12:00:00, we should get the following
 ```
 >>> # now = 2016-01-01 14:00:00+00:00
@@ -164,8 +165,8 @@ from datemath import dm
 >>> dm('now/d')
 <Arrow [2016-01-01T00:00:00+00:00]>
 ```   
-* v1.4.4 - Fixed bug with expression logic and rounding:  https://github.com/nickmaccarthy/python-datemath/pull/2
-* v1.4.3 - Floats are now supported for days, hours, and seconds units.  Example ```now-2.5d```, ```now-3.2h```. Any other unit other than days, hours, or seconds that is a float will be converted to an int and floored due to the datetime() module not being able to handle them.
+* `v1.4.4` - Fixed bug with expression logic and rounding:  https://github.com/nickmaccarthy/python-datemath/pull/2
+* `v1.4.3` - Floats are now supported for days, hours, and seconds units.  Example ```now-2.5d```, ```now-3.2h```. Any other unit other than days, hours, or seconds that is a float will be converted to an int and floored due to the datetime() module not being able to handle them.
 
 # Test
 ```python tests.py```