Require Node.js 10 (#113)

.travis.yml

@@ -1,7 +1,7 @@
 language: node_js
 node_js:
+  - '14'
   - '12'
   - '10'
-  - '8'
 before_install:
   - 'sudo chown $USER /usr/local'

package.json

@@ -8,7 +8,7 @@
 		"optipng": "cli.js"
 	},
 	"engines": {
-		"node": ">=8"
+		"node": ">=10"
 	},
 	"scripts": {
 		"postinstall": "node lib/install.js",
@@ -35,11 +35,11 @@
 		"logalot": "^2.0.0"
 	},
 	"devDependencies": {
-		"ava": "^1.4.1",
+		"ava": "^3.8.0",
 		"bin-check": "^4.0.1",
 		"compare-size": "^3.0.0",
-		"execa": "^1.0.0",
-		"tempy": "^0.3.0",
-		"xo": "^0.24.0"
+		"execa": "^4.0.0",
+		"tempy": "^0.5.0",
+		"xo": "^0.30.0"
 	}
 }

test/test.js

@@ -16,24 +16,24 @@ test('rebuild the optipng binaries', async t => {
 		return;
 	}
 
-	const tmp = tempy.directory();
+	const temporary = tempy.directory();
 
 	await binBuild.file(path.resolve(__dirname, '../vendor/source/optipng.tar.gz'), [
-		`./configure --with-system-zlib --prefix="${tmp}" --bindir="${tmp}"`,
+		`./configure --with-system-zlib --prefix="${temporary}" --bindir="${temporary}"`,
 		'make install'
 	]);
 
-	t.true(fs.existsSync(path.join(tmp, 'optipng')));
+	t.true(fs.existsSync(path.join(temporary, 'optipng')));
 });
 
 test('return path to binary and verify that it is working', async t => {
 	t.true(await binCheck(optipng, ['--version']));
 });
 
 test('minify a PNG', async t => {
-	const tmp = tempy.directory();
+	const temporary = tempy.directory();
 	const sourcePath = path.join(__dirname, 'fixtures/test.png');
-	const destinationPath = path.join(tmp, 'test.png');
+	const destinationPath = path.join(temporary, 'test.png');
 	const arguments_ = [
 		'-strip',
 		'all',