Preserve ------- comments

Fixes #67

Author: nene

src/printComment.ts

@@ -4,10 +4,10 @@ import { Whitespace } from "sql-parser-cst";
 export const printComment = (path: AstPath<Whitespace>): string => {
   const node = path.node;
   if (node.type === "line_comment") {
-    if (/^--[^ \t]/.test(node.text)) {
+    if (/^--[^ \t-]/.test(node.text)) {
       return node.text.replace(/^--/, "-- ");
     }
-    if (/^#[^ \t!]/.test(node.text)) {
+    if (/^#[^ \t!#]/.test(node.text)) {
       return node.text.replace(/^#/, "# ");
     }
   }

test/comments.test.ts

@@ -170,6 +170,29 @@ describe("comments", () => {
     `);
   });
 
+  // Issue #67
+  it(`preserves ------ comments as-is`, async () => {
+    rawTest(dedent`
+      SELECT 1;
+      ---------------------
+      -- Start main block
+      ---------------------
+      SELECT 1;
+
+    `);
+  });
+
+  it(`preserves ######### comments as-is`, async () => {
+    rawTest(dedent`
+      SELECT 1;
+      #####################
+      # Start main block
+      #####################
+      SELECT 1;
+
+    `);
+  });
+
   // Issue #9
   it.skip(`keeps separate-line line-comments on a separate line (not moving them to line end)`, async () => {
     rawTest(dedent`