Don't include 3MF files with Linguist

This corrects the programming language statistics on Github.
Ghostkeeper · Aug 31, 2020 · 074b09b · 074b09b
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commit 074b09b
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/.gitattributes b/.gitattributes
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+# Linguist misattributes 3MF files as "Roff", whatever that may be. It's not a programming language so don't classify it.
+*.3mf -linguist-detectable
+