feat(conda): add 3rd-party completion loader (argcomplete)

https://github.com/ohmybash/oh-my-bash/blob/b4a2264496e14f883101ec15e35607b2e7386acc/completions/conda.completion.sh

Author: akinomyoga

completions/.gitignore

@@ -53,6 +53,7 @@
 /compare
 /compgen
 /composite
+/_conda
 /conjure
 /_constellation
 /_consul

completions/Makefile.am

@@ -565,6 +565,7 @@ CLEANFILES = \
 	compare \
 	compgen \
 	composite \
+	_conda \
 	conjure \
 	_constellation \
 	_consul \
@@ -1112,6 +1113,7 @@ symlinks: $(DATA)
 		_ansible-playbook \
 		_ansible-pull \
 		_ansible-vault \
+		_conda \
 		_cz
 	$(ss) nslookup \
 		host