HDNode: fix error spelling

src/hdnode.js

@@ -52,8 +52,8 @@ HDNode.LENGTH = 78
 
 HDNode.fromSeedBuffer = function(seed, network) {
   assert(Buffer.isBuffer(seed), 'Expected Buffer, got' + seed)
-  assert(seed.length >= 16, 'Seed should be atleast 128 bits')
-  assert(seed.length <= 64, 'Seed should be atmost 512 bits')
+  assert(seed.length >= 16, 'Seed should be at least 128 bits')
+  assert(seed.length <= 64, 'Seed should be at most 512 bits')
 
   var I = crypto.HmacSHA512(seed, HDNode.MASTER_SECRET)
   var IL = I.slice(0, 32)

test/hdnode.js

@@ -69,13 +69,13 @@ describe('HDNode', function() {
     it('throws on low entropy seed', function() {
       assert.throws(function() {
         HDNode.fromSeedHex('ffffffffff')
-      }, /Seed should be atleast 128 bits/)
+      }, /Seed should be at least 128 bits/)
     })
 
     it('throws on too high entropy seed', function() {
       assert.throws(function() {
         HDNode.fromSeedHex('ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff')
-      }, /Seed should be atmost 512 bits/)
+      }, /Seed should be at most 512 bits/)
     })
   })