update scrypt version to improve the keystore performance

Author: shamatar

Podfile

@@ -1,5 +1,5 @@
 def import_pods
-  pod 'scrypt', '~> 1.5'
+  pod 'scrypt', '~> 1.6'
   pod "PromiseKit", "~> 6.3"
   pod 'BigInt', '~> 3.1'
   pod 'CryptoSwift', '~> 0.11'

Podfile.lock

@@ -2,17 +2,17 @@ PODS:
   - BigInt (3.1.0):
     - SipHash (~> 1.2)
   - CryptoSwift (0.11.0)
-  - PromiseKit (6.3.4):
-    - PromiseKit/CorePromise (= 6.3.4)
-    - PromiseKit/Foundation (= 6.3.4)
-    - PromiseKit/UIKit (= 6.3.4)
-  - PromiseKit/CorePromise (6.3.4)
-  - PromiseKit/Foundation (6.3.4):
+  - PromiseKit (6.4.0):
+    - PromiseKit/CorePromise (= 6.4.0)
+    - PromiseKit/Foundation (= 6.4.0)
+    - PromiseKit/UIKit (= 6.4.0)
+  - PromiseKit/CorePromise (6.4.0)
+  - PromiseKit/Foundation (6.4.0):
     - PromiseKit/CorePromise
-  - PromiseKit/UIKit (6.3.4):
+  - PromiseKit/UIKit (6.4.0):
     - PromiseKit/CorePromise
   - Result (3.2.4)
-  - scrypt (1.5):
+  - scrypt (1.6):
     - CryptoSwift (~> 0.11)
   - secp256k1_ios (0.1.3)
   - SipHash (1.2.2)
@@ -22,7 +22,7 @@ DEPENDENCIES:
   - CryptoSwift (~> 0.11)
   - PromiseKit (~> 6.3)
   - Result (~> 3.0)
-  - scrypt (~> 1.5)
+  - scrypt (~> 1.6)
   - secp256k1_ios (from `https://github.com/shamatar/secp256k1_ios.git`)
 
 SPEC REPOS:
@@ -46,12 +46,12 @@ CHECKOUT OPTIONS:
 SPEC CHECKSUMS:
   BigInt: 76b5dfdfa3e2e478d4ffdf161aeede5502e2742f
   CryptoSwift: ad5208dd2aae0a764ea4ce2c2d34bd067cae67f0
-  PromiseKit: e1425568123ec844a944c93f2bcb29d511d39cf5
+  PromiseKit: ae3616f45d7bb9bf4ff1e91abc9b7a8c48a340e0
   Result: d2d07204ce72856f1fd9130bbe42c35a7b0fea10
-  scrypt: 0da45be386be45f857d8545216148e86e753a9a1
+  scrypt: 9b08b4f2a45cb38d17026feb7e287cfca1603125
   secp256k1_ios: ac9ef04e761f43c58012b28548afa91493761f17
   SipHash: fad90a4683e420c52ef28063063dbbce248ea6d4
 
-PODFILE CHECKSUM: ee85c7e6b43ed8a658c17d7f72f086ad3a5af402
+PODFILE CHECKSUM: 6adb2e455ccff337782d78f394b1fdaa1d087882
 
 COCOAPODS: 1.5.3