Bump guard from 2.14.1 to 2.15.0

Bumps [guard](https://github.com/guard/guard) from 2.14.1 to 2.15.0.
- [Release notes](https://github.com/guard/guard/releases)
- [Changelog](https://github.com/guard/guard/blob/master/CHANGELOG.md)
- [Commits](https://github.com/guard/guard/compare/v2.14.1...v2.15.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Gemfile.lock

@@ -452,10 +452,10 @@ GEM
       ruby-progressbar (~> 1.4)
     geocoder (1.1.8)
     gmaps4rails (1.5.6)
-    guard (2.14.1)
+    guard (2.15.0)
       formatador (>= 0.2.4)
       listen (>= 2.7, < 4.0)
-      lumberjack (~> 1.0)
+      lumberjack (>= 1.0.12, < 2.0)
       nenv (~> 0.1)
       notiffany (~> 0.0)
       pry (>= 0.9.12)
@@ -515,11 +515,11 @@ GEM
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    lumberjack (1.0.12)
+    lumberjack (1.0.13)
     mail (2.5.5)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
-    method_source (0.9.0)
+    method_source (0.9.2)
     mime-types (1.25.1)
     mini_mime (1.0.1)
     mini_portile2 (2.1.0)
@@ -571,7 +571,7 @@ GEM
       activerecord (~> 3.0)
     polyglot (0.3.5)
     powerpack (0.1.1)
-    pry (0.11.2)
+    pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     pry-byebug (3.4.3)