[null-safety] add language version to freeform template (#69043)

b4469662 · Jonah Williams · GitHub · 17cdf555 · b4469662
Unverified Commit b4469662 authored Oct 26, 2020 by Jonah Williams Committed by GitHub Oct 26, 2020
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freeform.tmpl dev/snippets/config/templates/freeform.tmpl +1 -0

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--- a/dev/snippets/config/templates/freeform.tmpl
+++ b/dev/snippets/config/templates/freeform.tmpl
 /// Flutter code sample for {{element}}
+// @dart = 2.9

 {{description}}