Gemfile: don't require Jaeger gems if not used

While at it also drop unused gems.

Author: unleashed

Gemfile

@@ -11,10 +11,8 @@ gem 'sinatra'
 gem 'json'
 
 # Opentracing
-gem 'jaeger-client', '~> 1'
-gem 'opentracing', '~> 0.5'
-gem 'rack-tracer', '0.9.0'
-gem 'spanmanager', '= 0.3.0'
+gem 'jaeger-client', '~> 1', require: nil
+gem 'rack-tracer', '~> 0.9', require: nil
 
 group :development do
   gem 'shotgun'

Gemfile.lock

@@ -29,8 +29,6 @@ GEM
       rack (~> 2.2)
       rack-protection (= 2.1.0)
       tilt (~> 2.0)
-    spanmanager (0.3.0)
-      opentracing
     thrift (0.13.0)
     tilt (2.0.10)
 
@@ -42,14 +40,12 @@ DEPENDENCIES
   jaeger-client (~> 1)
   json
   nokogiri (~> 1)
-  opentracing (~> 0.5)
   puma
   rack (~> 2)
   rack-cors
-  rack-tracer (= 0.9.0)
+  rack-tracer (~> 0.9)
   shotgun
   sinatra
-  spanmanager (= 0.3.0)
 
 BUNDLED WITH
    2.2.1