Bump rbtrace version to 0.4.11

This change renames a dependency and fixes a minor bug, but this upgrade
is happening because Gitaly will be receiving rbtrace as a dependency.

Gemfile.lock

@@ -206,7 +206,7 @@ GEM
     fast_blank (1.0.0)
     fast_gettext (1.6.0)
     ffaker (2.10.0)
-    ffi (1.9.25)
+    ffi (1.10.0)
     flipper (0.13.0)
     flipper-active_record (0.13.0)
       activerecord (>= 3.2, < 6)
@@ -470,7 +470,7 @@ GEM
     mini_mime (1.0.1)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
-    msgpack (1.2.4)
+    msgpack (1.2.6)
     multi_json (1.13.1)
     multi_xml (0.6.0)
     multipart-post (2.0.0)
@@ -551,6 +551,7 @@ GEM
       nokogiri (>= 1.4.4)
       omniauth (~> 1.0)
     opentracing (0.4.3)
+    optimist (3.0.0)
     org-ruby (0.9.12)
       rubypants (~> 0.2)
     orm_adapter (0.5.0)
@@ -672,10 +673,10 @@ GEM
       ffi (>= 0.5.0, < 2)
     rblineprof (0.3.6)
       debugger-ruby_core_source (~> 1.3)
-    rbtrace (0.4.10)
+    rbtrace (0.4.11)
       ffi (>= 1.0.6)
       msgpack (>= 0.4.3)
-      trollop (>= 1.16.2)
+      optimist (>= 3.0.0)
     rdoc (6.0.4)
     re2 (1.1.1)
     recaptcha (3.0.0)
@@ -882,7 +883,6 @@ GEM
       parslet (~> 1.8.0)
     toml-rb (1.0.0)
       citrus (~> 3.0, > 3.0)
-    trollop (2.1.3)
     truncato (0.7.11)
       htmlentities (~> 4.3.1)
       nokogiri (>= 1.7.0, <= 2.0)