Post version policy

VERSIONS.md

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+<!-- vim:ts=4:sts=4:sw=4:et:tw=60 -->
+
+This library has the following policy about versions.
+
+-   Presently, all planned versions have a major version number of 0.
+-   The minor version number increases for every backward-incompatible
+    change to a documented behavior.
+-   The patch version number increases for every added feature,
+    backward-incompatible changes to undocumented features, and
+    bug-fixes.
+
+Upon the release of a version 1.0.0, the strategy will be revised.
+
+-   The major version will increase for any backward-incompatible
+    changes.
+-   The minor version will increase for added features.
+-   The patch version will increase for bug-fixes.
+