Update from_hash to walk Array objects (#1900)

Update from_hash to walk Array objects

Before:

    c = Pry::Config.from_hash ary: [{b: 2}]
    c.ary[0].class # => Hash
    c.ary[0].b     # => Raises NoMethodError

After:

    c = Pry::Config.from_hash ary: [{b: 2}]
    c.ary[0].class # => Pry::Config
    c.ary[0].b     # => 2

lib/pry/config/behavior.rb

@@ -98,7 +98,13 @@ class Pry
         def from_hash(attributes, default = nil)
           new(default).tap do |config|
             attributes.each do |key,value|
-              config[key] = Hash === value ? from_hash(value) : value
+              config[key] = if Hash === value
+                              from_hash(value)
+                            elsif Array === value
+                              value.map { |v| Hash === v ? from_hash(v) : v }
+                            else
+                              value
+                            end
             end
           end
         end

spec/config_spec.rb

@@ -11,12 +11,19 @@ RSpec.describe Pry::Config do
       expect(local.default).to eq(local)
     end
 
-    it "recursively creates Pry::Config objects from a Hash" do
+    it "recursively walks a Hash" do
       h = {'foo1' => {'foo2' => {'foo3' => 'foobar'}}}
       default = described_class.from_hash(h)
       expect(default.foo1).to be_instance_of(described_class)
       expect(default.foo1.foo2).to be_instance_of(described_class)
     end
+
+    it "recursively walks an Array" do
+      c = described_class.from_hash(ary: [{number: 2}, Object, BasicObject.new])
+      expect(c.ary[0].number).to eq(2)
+      expect(c.ary[1]).to eq(Object)
+      expect(BasicObject === c.ary[2]).to be(true)
+    end
   end
 
   describe "bug #1552" do