read readme changes

src/readmefile.ts

@@ -46,16 +46,26 @@ function getReadmeFileName(): string | null {
 function readReadmeFile(readmeFile: string): [string, string] {
     let content = readFileSync(readmeFile).toString()
     const regex =
-        /<!-- START INSTALL LINKS -->(?:.|\n)*?<!-- END INSTALL LINKS -->/
+        /\n{0,1}<!-- START INSTALL LINKS -->(?:.|\n)*?<!-- END INSTALL LINKS -->\n{0,1}/
     const index = regex.exec(content)?.index
 
+    let contentPre = '',
+        contentPost = ''
+
     if (index === undefined) {
-        if (!content.endsWith('\n')) {
-            content += '\n'
-        }
-        return [content, '']
+        contentPre = content
+    } else {
+        content = content.replace(regex, '')
+        contentPre = content.slice(0, index)
+        contentPost = content.slice(index)
     }
 
-    content = content.replace(regex, '')
-    return [content.slice(0, index), content.slice(index)]
+    if (!contentPre.endsWith('\n')) {
+        contentPre += '\n'
+    }
+    if (!contentPost.endsWith('\n')) {
+        contentPost += '\n'
+    }
+
+    return [contentPre, contentPost]
 }