minor edits.

README.md

@@ -14,11 +14,11 @@ The included file "demo-input.txt" was generated by Excel using the "demo-input.
 
 ## Differences 
 
-These are the significant differences from version 0.1 and 1.0.
+These are the significant differences from version v0.1-alpha and v1.0.
   1. The command line arguments have been greatly simplified.
   2. The number of AS levels is automatically computed.
   3. The input file has changed with this release. Cells are listed in a separate column from the children column.
-  4. Biomarkers and references can now be allied to any anatomical structure.
+  4. Biomarkers and references can now be added to any anatomical structure.
   5. The anytree Python module is required.
   6. A header is autogenerate in the output file.
   7. A DOT file can be generated to display the tree in Graphviz.