Yunchao/dg update two

[tanyunchao]

fixes #91

• added extensions to upcoming command in DG
• removed outdated extensions initially meant for old lc command

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 78.97%. Comparing base (fa0ff6c) to head (6a35bce).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #96 +/- ## ========================================= Coverage 78.97% 78.97% Complexity 568 568 ========================================= Files 89 89 Lines 1731 1731 Branches 169 169 ========================================= Hits 1367 1367 Misses 331 331 Partials 33 33 ```

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[Colex2000]

lgtm 😅😅😅