Add min version for Ruby and FakeWeb (pardot#55)

Author: Jared Pearson

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    ruby-pardot (1.3.2)
+    ruby-pardot (1.4.0)
       crack (= 0.4.3)
       httparty (= 0.18.1)
 
@@ -17,7 +17,7 @@ GEM
       multi_xml (>= 0.5.2)
     mime-types (3.3.1)
       mime-types-data (~> 3.2015)
-    mime-types-data (3.2020.0512)
+    mime-types-data (3.2020.1104)
     multi_xml (0.6.0)
     rspec (3.5.0)
       rspec-core (~> 3.5.0)
@@ -39,7 +39,7 @@ PLATFORMS
 
 DEPENDENCIES
   bundler (>= 1.10)
-  fakeweb
+  fakeweb (= 1.3.0)
   rspec (= 3.5.0)
   ruby-pardot!
 

ruby-pardot.gemspec

@@ -11,6 +11,7 @@ Gem::Specification.new do |s|
   s.summary     = "Library for interacting with the Pardot API"
   s.description = "Library for interacting with the Pardot API"
 
+  s.required_ruby_version = '>= 2.6'
   s.required_rubygems_version = ">= 1.3.6"
   s.rubyforge_project         = "ruby-pardot"
 
@@ -19,7 +20,7 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency "bundler", ">= 1.10"
   s.add_development_dependency "rspec", "3.5.0"
-  s.add_development_dependency "fakeweb"
+  s.add_development_dependency "fakeweb", "1.3.0"
 
   s.files        = `git ls-files`.split("\n")
   s.executables  = `git ls-files`.split("\n").map{|f| f =~ /^bin\/(.*)/ ? $1 : nil}.compact