bump version

bump version

diff --git a/lib/prometheus_exporter/version.rb b/lib/prometheus_exporter/version.rb
index a29ec2e..d2cc9d6 100644
--- a/lib/prometheus_exporter/version.rb
+++ b/lib/prometheus_exporter/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module PrometheusExporter
-  VERSION = '0.7.0'
+  VERSION = '0.8.0'
 end

GitHub sha: b9329b05fb383ebd595170bd027b0da9a8cfcde6