Rename project_count to projects for consistency with other counts

Gemfile.lock

 PATH
   remote: .
   specs:
-    gitlab-monitor (0.0.14)
+    gitlab-monitor (0.0.15)
       pg (~> 0.18.4)
       quantile (~> 0.2.0)
       redis-namespace (~> 1.5.2)

lib/gitlab_monitor/database/row_count.rb

@@ -9,7 +9,7 @@ module GitLab
       class RowCountCollector < Base
         QUERIES = {
           groups: { select: :namespaces, where: "type='Group'" },
-          project_count: { select: :projects, where: "pending_delete=false" },
+          projects: { select: :projects, where: "pending_delete=false" },
           soft_deleted_projects: { select: :projects, where: "pending_delete=true" },
           orphaned_projects: {
             select: :projects,

lib/gitlab_monitor/version.rb

 module GitLab
   module Monitor
-    VERSION = "0.0.14".freeze
+    VERSION = "0.0.15".freeze
   end
 end