renamed some tests

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

diff --git a/t/00-use.t b/t/sanity.t
similarity index 100%
rename from t/00-use.t
rename to t/sanity.t

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