Move back to older version of acme-client

Gemfile

@@ -35,7 +35,7 @@ gem 'simpleidn'
 gem 'gandi'
 gem 'hoe', '3.14.2', require: nil
 gem 'msgpack'
-gem 'acme-client'
+gem 'acme-client', '0.6.3'
 gem 'http'
 gem 'htmlentities'
 gem 'rinku'

Gemfile.lock

@@ -12,7 +12,7 @@ GIT
 GEM
   remote: https://rubygems.org/
   specs:
-    acme-client (2.0.1)
+    acme-client (0.6.3)
       faraday (~> 0.9, >= 0.9.1)
     activesupport (5.2.2)
       concurrent-ruby (~> 1.0, >= 1.0.2)
@@ -286,7 +286,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  acme-client
+  acme-client (= 0.6.3)
   activesupport
   addressable
   base32
@@ -360,4 +360,4 @@ DEPENDENCIES
   zipruby
 
 BUNDLED WITH
-   1.16.1
+   1.16.4