use md-to-pdf v0.1.4

Gemfile

@@ -2,7 +2,7 @@
 
 source 'https://rubygems.org'
 
-# gem "md_to_pdf", github: "opf/md-to-pdf", tag: 'v0.1.0'
-gem "md_to_pdf",  git: "https://github.com/opf/md-to-pdf", ref: "f522be9c60d4e8cdd68069c1d438c2a2083db592"
+# gem "md_to_pdf", github: "opf/md-to-pdf", tag: 'v0.1.4'
+gem "md_to_pdf",  git: "https://github.com/opf/md-to-pdf", ref: "f09eefecbe5e7a12686237791142b641d00e0686"
 gem "prawn", "~> 2.4" # remove after https://github.com/prawnpdf/prawn/issues/1346 resolved.
 gem "ttfunk", "~> 1.7.0" # remove after https://github.com/prawnpdf/prawn/issues/1346 resolved.

Gemfile.lock

@@ -1,9 +1,9 @@
 GIT
   remote: https://github.com/opf/md-to-pdf
-  revision: f522be9c60d4e8cdd68069c1d438c2a2083db592
-  ref: f522be9c60d4e8cdd68069c1d438c2a2083db592
+  revision: f09eefecbe5e7a12686237791142b641d00e0686
+  ref: f09eefecbe5e7a12686237791142b641d00e0686
   specs:
-    md_to_pdf (0.1.0)
+    md_to_pdf (0.1.4)
       color_conversion (~> 0.1)
       front_matter_parser (~> 1.0)
       json-schema (~> 4.3)
@@ -19,24 +19,28 @@ GEM
   specs:
     addressable (2.8.7)
       public_suffix (>= 2.0.2, < 7.0)
-    color_conversion (0.1.1)
+    color_conversion (0.1.2)
     front_matter_parser (1.0.1)
-    json-schema (4.3.0)
+    json-schema (4.3.1)
       addressable (>= 2.8)
-    markly (0.10.0)
+    markly (0.12.1)
     matrix (0.4.2)
-    mini_portile2 (2.8.7)
-    nokogiri (1.16.6)
+    mini_portile2 (2.8.8)
+    nokogiri (1.18.1)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
+    nokogiri (1.18.1-arm64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.18.1-x86_64-linux-gnu)
+      racc (~> 1.4)
     pdf-core (0.9.0)
     prawn (2.4.0)
       pdf-core (~> 0.9.0)
       ttfunk (~> 1.7)
     prawn-table (0.2.2)
       prawn (>= 1.3.0, < 3.0.0)
-    public_suffix (6.0.0)
-    racc (1.8.0)
+    public_suffix (6.0.1)
+    racc (1.8.1)
     text-hyphen (1.5.0)
     ttfunk (1.7.0)