Add missing mapping flag for erlang

Author: valpackett

build.ps1

@@ -39,7 +39,7 @@ java -jar $GEN generate -i $SPEC -g cpp-qt-client --artifact-version $VERSION --
 java -jar $GEN generate -i $SPEC -g csharp --artifact-version $VERSION --additional-properties "packageVersion=${VERSION},project-name=spoonacular,packageName=spoonacular"  --git-repo-id=spoonacular-api-clients/tree/master/csharp/ --git-user-id=ddsky --artifact-id csharp-client -o csharp --additional-properties "hideGenerationTimestamp=true,packageGuid={F31A0234-3AB7-4F0C-B889-AECE893F4AC5}" --name-mappings _=Underscore
 java -jar $GEN generate -i $SPEC -g dart --artifact-version $VERSION --additional-properties "packageVersion=${VERSION},project-name=spoonacular,packageName=spoonacular"  --git-repo-id=spoonacular-api-clients/tree/master/dart/ --git-user-id=ddsky --artifact-id dart-client -o dart
 java -jar $GEN generate -i $SPEC -g elixir --artifact-version $VERSION --additional-properties "packageVersion=${VERSION},project-name=spoonacular,packageName=spoonacular"  --git-repo-id=spoonacular-api-clients/tree/master/elixir/ --git-user-id=ddsky --artifact-id elixir-client -o elixir
-java -jar $GEN generate -i $SPEC -g erlang-client --artifact-version $VERSION --additional-properties "packageVersion=${VERSION},project-name=spoonacular,packageName=spoonacular"  --git-repo-id=spoonacular-api-clients/tree/master/erlang/ --git-user-id=ddsky --artifact-id erlang-client -o erlang
+java -jar $GEN generate -i $SPEC -g erlang-client --artifact-version $VERSION --additional-properties "packageVersion=${VERSION},project-name=spoonacular,packageName=spoonacular"  --git-repo-id=spoonacular-api-clients/tree/master/erlang/ --git-user-id=ddsky --artifact-id erlang-client -o erlang --name-mappings _=Underscore
 java -jar $GEN generate -i $SPEC -g go --artifact-version $VERSION --additional-properties "packageVersion=${VERSION},project-name=spoonacular,packageName=spoonacular"  --git-repo-id=spoonacular-api-clients/go --git-user-id=ddsky --artifact-id go-client -o go --name-mappings _=Underscore
 java -jar $GEN generate -i $SPEC -g php --artifact-version $VERSION --additional-properties "packageVersion=${VERSION},project-name=spoonacular,packageName=spoonacular"  --git-repo-id=spoonacular-api-clients/tree/master/php/ --git-user-id=ddsky --artifact-id php-client -o php
 java -jar $GEN generate -i $SPEC -g python --artifact-version $VERSION --additional-properties "packageVersion=${VERSION},project-name=spoonacular,packageName=spoonacular"  --git-repo-id=spoonacular-api-clients/tree/master/python/ --git-user-id=ddsky --artifact-id python-client -o python --name-mappings _=underscore