Pin sodium-universal to 3.0.2

[paul90]

A temp. fix for #72

This pins sodium-universal to 3.0.2 which will modify the version used by other dependencies.

npm ls sodium-universal currently shows

[email protected]
├─┬ [email protected]
│ └── [email protected]
└─┬ [email protected]
  └─┬ [email protected]
    └─┬ [email protected]
      ├─┬ [email protected]
      │ └── [email protected]  deduped
      └── [email protected]  deduped

and becomes with this change

[email protected]
├─┬ [email protected]
│ └── [email protected]  deduped
├─┬ [email protected]
│ └─┬ [email protected]
│   └─┬ [email protected]
│     ├─┬ [email protected]
│     │ └── [email protected]  deduped
│     └── [email protected]  deduped
└── [email protected]

The only difference I see between 3.0.2 and 3.0.3 is an update to the version of sodium-javascript being used.

[paul90]

Closing as a probable underlying cause has been identified.