composer.json is malformed

Problem/Motivation

$ composer list

[Seld\JsonLint\ParsingException]
"./composer.json" does not contain valid JSON
Parse error on line 16:
...": "dev-master" "drupal/commerce": "
---------------------^
Expected one of: 'EOF', '}', ':', ',', ']'

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes