Fix there are extra leading/trailing lines when context is set to 0

Signed-off-by: Jack Cherng <[email protected]>

Author: jfcherng

composer.json

@@ -34,7 +34,7 @@
     "require": {
         "php": "^7.1.3",
         "jfcherng/php-mb-string": "^1.3",
-        "jfcherng/php-sequence-matcher": "^3.2"
+        "jfcherng/php-sequence-matcher": "^3.2.2"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^2.16",