Added rerun gem to auto-reload the app

Gemfile

@@ -5,3 +5,7 @@ gem 'puma', '~> 6.0'
 
 gem 'sequel', '~> 5.63'
 gem 'sqlite3', '~> 1.5'
+
+# Use rerun gem to auto-reload app
+gem 'rerun'
+

Gemfile.lock

@@ -1,6 +1,11 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    ffi (1.15.5)
+    ffi (1.15.5-x64-mingw-ucrt)
+    listen (3.7.1)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
     mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.5.8)
@@ -9,6 +14,11 @@ GEM
     rack (2.2.4)
     rack-protection (3.0.4)
       rack
+    rb-fsevent (0.11.2)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
+    rerun (0.13.1)
+      listen (~> 3.0)
     ruby2_keywords (0.0.5)
     sequel (5.63.0)
     sinatra (3.0.4)
@@ -17,13 +27,16 @@ GEM
       rack-protection (= 3.0.4)
       tilt (~> 2.0)
     sqlite3 (1.5.4-x64-mingw-ucrt)
+    sqlite3 (1.5.4-x86_64-linux)
     tilt (2.0.11)
 
 PLATFORMS
   x64-mingw-ucrt
+  x86_64-linux
 
 DEPENDENCIES
   puma (~> 6.0)
+  rerun
   sequel (~> 5.63)
   sinatra (~> 3.0)
   sqlite3 (~> 1.5)