Apply workaround for Coq 8.6 and Coq 8.7 #5
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New versions of Coq (8.6 and later) seem to require some modification of proof-tree. I'm not quite sure if it is appropriate but the patch works fine for me with Coq 8.6. (Coq 8.7 and 8.8 require Proof General's modification, too, though.)