Update readme.

README.rst

@@ -2,6 +2,8 @@
 Segpy 2
 =======
 
+Segpy is open source software created by Sixty North and licensed under the GNU Affero General Public License.
+
 Status
 ======
 
@@ -10,6 +12,9 @@ Build status: rewrite branch:
 .. image:: https://travis-ci.org/rob-smallshire/segpy.svg?branch=rewrite
     :target: https://travis-ci.org/rob-smallshire/segpy
 
+Segpy is alpha software but is usable in its current form.  That said you should expect minor breaking API changes
+between now and official release of a Segpy 2.
+
 What is Segpy?
 ==============
 
@@ -20,9 +25,11 @@ non-profit organization.
 This project aims to implement an open SEG Y module in Python for transporting seismic data between SEG Y files and
 Python data structures in pure Python.
 
+
 Segpy Versions
 ==============
 
-Segpy 2.0 is a complete re-imagining of a SEG Y reader in Python and represents a complete break from the older
-Segpy 1.0 in terms of the interface it presents to clients and the implementation behind those interfaces.
-Segpy 1.0 should be considered unmaintained legacy software. The present and future of Segpy is Segpy 2.
+Segpy 2.0 is a complete re-imagining of a SEG Y reader in Python and represents a complete break from all older versions
+of Segpy.  No attempt has been made to maintain API compatibility with earlier versions of Segpy and no code is shared
+across versions.  Although earlier versions of Segpy were open source, they were never 'released' as such.  Earlier
+versions of Segpy are considered deprecated and completely unsupported.