Harmonize build rule names to use hyphen instead of underscore

Change-Id: I31a4435d3f26edb6e9adbecdd88d8a9cedca8c0b

lib/BUILD

diff --git a/lib/BUILD b/lib/BUILD
index 9aef1e0..d1c1e79 100644
--- a/lib/BUILD
+++ b/lib/BUILD
@@ -4,7 +4,7 @@
 
 [java_library(
     name = n,
-    exports = ["@%s//jar" % n.replace("-", "_")],
+    exports = ["@%s//jar" % n],
 ) for n in [
     "autolink",
     "commonmark",