Ensure blank line before quote and table blocks

quote.go

@@ -23,6 +23,7 @@ func (b *Quote) printHTML(p *printer) {
 }
 
 func (b *Quote) printMarkdown(p *printer) {
+	p.maybeNL()
 	p.maybeQuoteNL('>')
 	p.WriteString("> ")
 	defer p.pop(p.push("> "))

table.go

@@ -93,6 +93,7 @@ func (t *Table) printMarkdown(p *printer) {
 		rows = append(rows, xrow)
 	}
 
+	p.maybeNL()
 	p.maybeQuoteNL('|')
 	for i, cell := range hdr {
 		p.WriteString("| ")

testdata/basic_fmt.txt

@@ -229,6 +229,7 @@ placed within the reach of poodles.
 The end.
 -- want --
 As Celine said:
+
 > Love is the infinite
 > placed within the reach of poodles.
 

testdata/table_fmt.txt

@@ -41,3 +41,10 @@
 | --- | -------- | --- |
 | 1   | 22345678 | 3   |
 | a   | b        | c   |
+-- preceding text --
+Text.
+
+| foo | bar      | baz |
+| --- | -------- | --- |
+| 1   | 22345678 | 3   |
+| a   | b        | c   |