Modernize.

Updated dependencies.
Fixed lint errors.
Dropped node 4 support.

.travis.yml

@@ -1,7 +1,6 @@
 sudo: false
 language: node_js
 node_js:
-    - "4"
     - "6"
     - "8"
     - "10"

README.md

@@ -23,7 +23,7 @@ If you don't specify an algorithm, the 64-bit single-core `B` algorithm is used.
 var Avon = require('avon');
 var assert = require('assert');
 
-var buf = new Buffer('this is some input');
+var buf = Buffer.from('this is some input');
 
 var hash = Avon.sumBuffer(buf, Avon.ALGORITHMS.BP);
 assert(hash instanceof Buffer);

index.js

@@ -1,10 +1,10 @@
-var
+const
 	bindings = require('bindings'),
 	blake2   = bindings('blake2'),
 	P        = require('p-promise')
 	;
 
-var B = 0,
+const B = 0,
 	BP = 1,
 	S = 2,
 	SP = 3;
@@ -16,7 +16,7 @@ function wrapperFile(algo, fname)
 
 	var deferred = P.defer();
 
-	blake2.b2_file(algo, fname, function(err, result)
+	blake2.b2_file(algo, fname, (err, result) =>
 	{
 		if (err) deferred.reject(err);
 		else deferred.resolve(result);
@@ -32,7 +32,7 @@ function sumBuffer(buffer, algorithm)
 
 	if (!Buffer.isBuffer(buffer))
 	{
-		throw new Error('You must pass a buffer as input.');
+		throw new TypeError('You must pass a buffer as input.');
 	}
 
 	return blake2.b2_buffer(algorithm, buffer);
@@ -51,8 +51,8 @@ function sumFile(fname, algorithm, callback)
 module.exports =
 {
 	// convenience wrappers
-	sumBuffer:  sumBuffer,
-	sumFile:    sumFile,
+	sumBuffer,
+	sumFile,
 	sumStream:  require('./streaming'),
 	ALGORITHMS: require('./streaming').ALGORITHMS,