Set the TLS version manually

Hopefull this prevents SSL errors such as #203

config/initializers/ssl.rb

@@ -0,0 +1,7 @@
+# By default Ruby 2.5 tries to use SSLv23.
+# This sometimes causes this error:
+#   OpenSSL::SSL::SSLError: SSL_connect returned=1 errno=0 state=SSLv2/v3 read server hello A
+#
+# See: https://stackoverflow.com/questions/9175151/connecting-using-https-to-a-server-with-a-certificate-signed-by-a-ca-i-created/9262269#9262269
+
+OpenSSL::SSL::SSLContext::DEFAULT_PARAMS[:ssl_version] = 'TLSv1_2'