Update development dependencies to solve error

Author: andyw8

Gemfile.lock

@@ -6,30 +6,30 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    diff-lcs (1.5.0)
-    rake (10.5.0)
-    rspec (3.12.0)
-      rspec-core (~> 3.12.0)
-      rspec-expectations (~> 3.12.0)
-      rspec-mocks (~> 3.12.0)
-    rspec-core (3.12.0)
-      rspec-support (~> 3.12.0)
-    rspec-expectations (3.12.2)
+    diff-lcs (1.6.2)
+    rake (13.3.0)
+    rspec (3.13.1)
+      rspec-core (~> 3.13.0)
+      rspec-expectations (~> 3.13.0)
+      rspec-mocks (~> 3.13.0)
+    rspec-core (3.13.5)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.5)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.12.0)
-    rspec-mocks (3.12.2)
+      rspec-support (~> 3.13.0)
+    rspec-mocks (3.13.5)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.12.0)
-    rspec-support (3.12.0)
+      rspec-support (~> 3.13.0)
+    rspec-support (3.13.4)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  bundler (~> 1.17)
-  rake (~> 10.0)
+  bundler (~> 2.6)
+  rake (~> 13.0)
   readwise!
   rspec (~> 3.0)
 
 BUNDLED WITH
-   2.4.4
+   2.6.9

readwise.gemspec

@@ -36,7 +36,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.add_development_dependency "bundler", "~> 1.17"
-  spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "bundler", "~> 2.6"
+  spec.add_development_dependency "rake", "~> 13.0"
   spec.add_development_dependency "rspec", "~> 3.0"
 end