remove test numbers

diff --git a/t/01-basic.t b/t/basic.t
similarity index 100%
rename from t/01-basic.t
rename to t/basic.t

diff --git a/t/04-canonicalize-source.t b/t/canonicalize-source.t
similarity index 100%
rename from t/04-canonicalize-source.t
rename to t/canonicalize-source.t

diff --git a/t/02-close-over.t b/t/close-over.t
similarity index 100%
rename from t/02-close-over.t
rename to t/close-over.t

diff --git a/t/11-debugger.t b/t/debugger.t
similarity index 100%
rename from t/11-debugger.t
rename to t/debugger.t

diff --git a/t/03-description.t b/t/description.t
similarity index 100%
rename from t/03-description.t
rename to t/description.t

diff --git a/t/10-errors.t b/t/errors.t
similarity index 100%
rename from t/10-errors.t
rename to t/errors.t

diff --git a/t/05-memoize.t b/t/memoize.t
similarity index 100%
rename from t/05-memoize.t
rename to t/memoize.t