Update gems

Gemfile.lock

@@ -11,7 +11,7 @@ GEM
       coderay (>= 1.0.0)
       erubi (>= 1.0.0)
       rack (>= 0.9.0)
-    browser (2.4.0)
+    browser (2.5.0)
     coderay (1.1.1)
     coffee-script (2.4.1)
       coffee-script-source
@@ -28,7 +28,7 @@ GEM
     ffi (1.9.18)
     fspath (3.1.0)
     highline (1.7.8)
-    html-pipeline (2.6.0)
+    html-pipeline (2.7.0)
       activesupport (>= 2)
       nokogiri (>= 1.4)
     i18n (0.8.6)
@@ -38,7 +38,7 @@ GEM
       image_size (~> 1.5)
       in_threads (~> 1.3)
       progress (~> 3.0, >= 3.0.1)
-    image_optim_pack (0.5.0.20170803)
+    image_optim_pack (0.5.0.20170815)
       fspath (>= 2.1, < 4)
       image_optim (~> 0.19)
     image_size (1.5.0)
@@ -47,7 +47,7 @@ GEM
     mini_portile2 (2.2.0)
     minitest (5.10.3)
     multi_json (1.12.1)
-    mustermann (1.0.0)
+    mustermann (1.0.1)
     nokogiri (1.8.0)
       mini_portile2 (~> 2.2.0)
     options (2.3.2)
@@ -96,16 +96,16 @@ GEM
       daemons (~> 1.0, >= 1.0.9)
       eventmachine (~> 1.0, >= 1.0.4)
       rack (>= 1, < 3)
-    thor (0.19.4)
+    thor (0.20.0)
     thread_safe (0.3.6)
     tilt (2.0.8)
-    tty-pager (0.8.0)
+    tty-pager (0.9.0)
       tty-screen (~> 0.5.0)
       tty-which (~> 0.3.0)
       verse (~> 0.5.0)
     tty-screen (0.5.0)
     tty-which (0.3.0)
-    typhoeus (1.1.2)
+    typhoeus (1.3.0)
       ethon (>= 0.9.0)
     tzinfo (1.2.3)
       thread_safe (~> 0.1)