escape names with invalid characters in mongodb query field selection#175

hallettj merged 3 commits intov1hasura/ndc-mongodb:v1from

jessehallett/eng-1840-mongodb-connector-fails-on-aggregate-selection-due-tohasura/ndc-mongodb:jessehallett/eng-1840-mongodb-connector-fails-on-aggregate-selection-due-toCopy head branch name to clipboard