Spelling (#703)

diff --git a/makerelease.py b/makerelease.py
index ba2e9aa..bc716cb 100644
--- a/makerelease.py
+++ b/makerelease.py
@@ -265,7 +265,7 @@
 
 Must be started in the project top directory.
 
-Warning: --force should only be used when developping/testing the release script.
+Warning: --force should only be used when developing/testing the release script.
 """
     from optparse import OptionParser
     parser = OptionParser(usage=usage)
@@ -377,7 +377,7 @@
                                          user=options.user, sftp=options.sftp)
             print('Source and doc release tarballs uploaded')
         else:
-            print('No upload user specified. Web site and download tarbal were not uploaded.')
+            print('No upload user specified. Web site and download tarball were not uploaded.')
             print('Tarball can be found at:', doc_tarball_path)
 
         # Set next version number and commit