{
    "name": "postcss-australian-stylesheets",
    "version": "0.0.6",
    "description": "PostCSS plugin for writing Australian Style Sheets",
    "keywords": ["postcss", "css", "postcss-plugin", "australia", "australian", "australian-stylesheets"],
    "author": "David Lewis <mail@david-lewis.com>",
    "license": "MIT",
    "repository": {
        "type": "git",
        "url":  "https://github.com/dp-lewis/postcss-australian-stylesheets.git"
    },
    "dependencies": {
        "postcss": "^4.1.5"
    },
    "devDependencies": {
        "gulp-eslint": "0.9.0",
        "gulp-mocha":  "2.0.1",
        "chai":        "2.2.0",
        "gulp":        "3.8.11"
    },
    "scripts": {
        "test": "gulp"
    }
}

{
    "name": "postcss-australian-stylesheets",
    "version": "0.0.6",
    "description": "PostCSS plugin for writing Australian Style Sheets",
    "keywords": ["postcss", "css", "postcss-plugin", "australia", "australian", "australian-stylesheets"],
    "author": "David Lewis <mail@david-lewis.com>",
    "license": "MIT",
    "repository": {
        "type": "git",
        "url":  "https://github.com/dp-lewis/postcss-australian-stylesheets.git"
    },
    "dependencies": {
        "postcss": "^4.1.5"
    },
    "devDependencies": {
        "gulp-eslint": "0.9.0",
        "gulp-mocha":  "6.0.0",
        "chai":        "2.2.0",
        "gulp":        "3.8.11"
    },
    "scripts": {
        "test": "gulp"
    }
}

Update dependency gulp-mocha to v6
Update dependency gulp-mocha to v6