Update composer dependencies

vendor/michelf/php-markdown/test/resources/php-markdown-extra.mdtest/Footnotes.text

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+This is the first paragraph.[^first]
+
+[^first]:  This is the first note.
+
+* List item one.[^second]
+* List item two.[^third]
+
+[^third]: This is the third note, defined out of order.
+[^second]: This is the second note.
+[^fourth]: This is the fourth note.
+
+# Header[^fourth]
+
+Some paragraph with a footnote[^1], and another[^2].
+
+[^1]: Content for fifth footnote.
+[^2]: Content for sixth footnote spaning on 
+    three lines, with some span-level markup like
+    _emphasis_, a [link][].
+
+[link]: http://michelf.ca/
+
+Another paragraph with a named footnote[^fn-name].
+
+[^fn-name]:
+    Footnote beginning on the line next to the marker.
+
+This paragraph should not have a footnote marker since 
+the footnote is undefined.[^3]
+
+This paragraph has a second footnote marker to footnote number one.[^1]
+
+This paragraph links to a footnote with plenty of 
+block-level content.[^block]
+
+[^block]:
+	Paragraph.
+	
+	*   List item
+	
+	> Blockquote
+	
+	    Code block
+
+This paragraph host the footnote reference within a 
+footnote test[^reference].
+
+[^reference]:
+	This footnote has a footnote of its own.[^nested]
+
+[^nested]:
+	This footnote should appear even though it is referenced
+	from another footnote. But [^reference] should be litteral
+	since the footnote with that name has already been used.
+
+ - - -
+
+Testing unusual footnote name[^1$^!"'].
+
+[^1$^!"']: Haha!
+
+ - - -
+ 
+Footnotes mixed with images[^image-mixed]
+![1800 Travel][img6]
+![1830 Travel][img7]
+
+[img6]: images/MGR-1800-travel.jpeg "Travel Speeds in 1800"
+[^image-mixed]: Footnote Content
+[img7]: images/MGR-1830-travel.jpeg "Travel Speeds in 1830"