Generate missing Cargo.lock file

--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,71 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
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+
+[[package]]
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+ "deunicode",
+ "pulldown-cmark",
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+dependencies = [
+ "bitflags",
+ "getopts",
+ "memchr",
+ "unicase",
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+[[package]]
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+ "version_check",
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+[[package]]
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