do not hash subject in body payload

lib/firetail.rb

@@ -174,7 +174,7 @@ def log(env,
           headers: response_headers,
        },
        oauth: subject ? {
-         subject: sha1_hash(subject),
+         subject: subject,
        } : nil,
       }.compact) # .compact removes keys with nil values, so we avoid sending empty values
       @request.body.rewind
@@ -218,12 +218,6 @@ def log(env,
       Firetail.logger.error(exception.message)
     end
 
-    def sha1_hash(value)
-      encode_utf8 = value.encode(Encoding::UTF_8)
-      hash = Digest::SHA1.hexdigest(encode_utf8)
-      sha1 = "sha1: #{hash}"
-    end
-
     def jwt_decoder(value)
       bearer_string = value
       # if authorization exists, get the value at index

spec/firetail_spec.rb

@@ -99,12 +99,6 @@
   end
 
   context "backend logic" do
-    it "should be able to generate correct sha1sum string" do
-      api_key = "abc123"
-      hash = @app.sha1_hash(api_key.encode(Encoding::UTF_8))
-      hash_computed = Digest::SHA1.hexdigest(api_key)
-      expect(hash).to eq("sha1: #{hash_computed}")
-    end
 
     it "should be able to correctly run backoff strategy for failure from retries" do
       url = "https://api.logging.eu-west-1.prod.firetail.app/logs/bulk"