feat(ngrok): add 3rd party fallback completion loader (#1252)

https://ngrok.com/docs/agent/cli/#ngrok-completion

Co-authored-by: Ville Skyttä <[email protected]>

Author: akinomyoga

completions/.gitignore

@@ -204,6 +204,7 @@
 /neomutt
 /_nerdctl
 /_nfpm
+/_ngrok
 /_nomad
 /_npm
 /_oc

completions/Makefile.am

@@ -766,6 +766,7 @@ CLEANFILES = \
 	neomutt \
 	_nerdctl \
 	_nfpm \
+	_ngrok \
 	_nomad \
 	_npm \
 	_oc \
@@ -1002,7 +1003,7 @@ symlinks: $(DATA)
 	$(ss) freeciv-server \
 		civserver
 	$(ss) _gaiacli \
-		_gaiad _npm _tendermint
+		_gaiad _ngrok _npm _tendermint
 	$(ss) gcc \
 		c++ cc f77 f95 g++ g++-5 g++-6 g++-7 g++-8 g77 g95 gcc-5 \
 		gcc-6 gcc-7 gcc-8 gccgo gccgo-5 gccgo-6 gccgo-7 gccgo-8 gcj \