checks.bash: exclude binary files from misspell

Change-Id: I0ad06af8b1ab783c6d1b8ef8af85b4921f7ee439
Reviewed-on: https://go-review.googlesource.com/c/pkgsite-metrics/+/467235
Run-TryBot: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Julie Qiu <julieqiu@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
diff --git a/checks.bash b/checks.bash
index d1ef2e8..1b41e8e 100755
--- a/checks.bash
+++ b/checks.bash
@@ -83,7 +83,7 @@
 # check_misspell runs misspell on source files.
 check_misspell() {
   ensure_go_binary github.com/client9/misspell/cmd/misspell
-  runcmd misspell -error $(find . -name .git -prune -o -type f -not -name modules.txt)
+  runcmd misspell -error $(find . -name .git -prune -o -type f -not -name modules.txt -not -name *.svg -not -name *.ts.snap)
 }
 
 go_linters() {