Update json-schema exception message comparisons

Fixes issues introduced with jsonrainbow/json-schema#170

Author: jessedc

tests/PhpUnit/GuzzleAssertsTraitTest.php

@@ -59,7 +59,7 @@ public function testAssertResponseBodyDoesNotMatch()
             self::assertEquals(
                 <<<EOF
 Failed asserting that [{"id":123456789}] is valid.
-[0] the property name is required
+[name] The property name is required
 
 EOF
                 ,
@@ -100,7 +100,7 @@ public function testAssertResponseHeaderDoesNotMatch()
             self::assertEquals(
                 <<<EOF
 Failed asserting that {"Content-Type":"application\/json"} is valid.
-[] the property ETag is required
+[ETag] The property ETag is required
 
 EOF
                 ,

tests/PhpUnit/ResponseBodyConstraintTest.php

@@ -67,7 +67,7 @@ public function testInvalidSchema()
             self::assertEquals(
                 <<<EOF
 Failed asserting that [{"id":123456789}] is valid.
-[0] the property name is required
+[name] The property name is required
 
 EOF
                 ,

tests/PhpUnit/ResponseHeadersConstraintTest.php

@@ -58,7 +58,7 @@ public function testInvalidHeaderType()
             self::assertEquals(
                 <<<EOF
 Failed asserting that {"Content-Type":"application\/json"} is valid.
-[] the property ETag is required
+[ETag] The property ETag is required
 
 EOF
                 ,