updated gem source and Gemfile

Gemfile

@@ -1,4 +1,4 @@
-source 'http://ruby.taobao.org'
+source 'https://rubygems.org'
 
 # Specify your gem's dependencies in qiniu-s3.gemspec
 gemspec

Gemfile.lock

@@ -1,10 +1,11 @@
 PATH
   remote: .
   specs:
-    qiniu-rs (1.1.0)
-      json
-      mime-types
-      rest-client
+    qiniu-rs (2.0.2)
+      json (~> 1.7.3)
+      mime-types (~> 1.19)
+      rest-client (~> 1.6.7)
+      ruby-hmac (~> 0.4.0)
 
 GEM
   remote: https://rubygems.org/
@@ -12,7 +13,7 @@ GEM
     diff-lcs (1.1.3)
     fakeweb (1.3.0)
     json (1.7.3)
-    mime-types (1.18)
+    mime-types (1.19)
     rake (0.9.2.2)
     rest-client (1.6.7)
       mime-types (>= 1.16)
@@ -24,12 +25,13 @@ GEM
     rspec-expectations (2.10.0)
       diff-lcs (~> 1.1.3)
     rspec-mocks (2.10.1)
+    ruby-hmac (0.4.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  fakeweb
+  fakeweb (~> 1.3.0)
   qiniu-rs!
-  rake
-  rspec
+  rake (~> 0.9.2.2)
+  rspec (~> 2.10.0)