Update gem dependencies

lib/prometheus/client/metric.rb

@@ -36,9 +36,8 @@ def get(labels = {})
 
       def values
         synchronize do
-          @values.reduce({}) do |memo, (labels, value)|
+          @values.each_with_object({}) do |(labels, value), memo|
             memo[labels] = value
-            memo
           end
         end
       end

lib/prometheus/client/rack/exporter.rb

@@ -74,10 +74,9 @@ def not_acceptable(formats)
         end
 
         def build_dictionary(formats)
-          formats.reduce({}) do |memo, format|
+          formats.each_with_object({}) do |format, memo|
             memo[format::CONTENT_TYPE] = format
             memo[format::MEDIA_TYPE] = format
-            memo
           end
         end
       end

lib/prometheus/client/summary.rb

@@ -28,9 +28,8 @@ def get(labels = {})
       # Returns all label sets with their values
       def values
         synchronize do
-          @values.reduce({}) do |memo, (labels, value)|
+          @values.each_with_object({}) do |(labels, value), memo|
             memo[labels] = transform(value)
-            memo
           end
         end
       end
@@ -42,9 +41,8 @@ def default
       end
 
       def transform(estimator)
-        estimator.invariants.reduce({}) do |memo, invariant|
+        estimator.invariants.each_with_object({}) do |invariant, memo|
           memo[invariant.quantile] = estimator.query(invariant.quantile)
-          memo
         end
       end
     end

prometheus-client.gemspec

@@ -15,5 +15,5 @@ Gem::Specification.new do |s|
   s.files             = %w(README.md) + Dir.glob('{lib/**/*}')
   s.require_paths     = ['lib']
 
-  s.add_dependency 'quantile', '~> 0.1.0'
+  s.add_dependency 'quantile', '~> 0.2.0'
 end