Update phase 1.sql since Jackson/Spring does some parsing and it needs it to be underscored

phase 1.sql

@@ -6,7 +6,7 @@ CREATE TABLE IF NOT EXISTS USER (
     lname VARCHAR(64) NOT NULL,
     fname VARCHAR(64) NOT NULL,
     password VARCHAR(32) NOT NULL,
-    phoneNumber INT,
+    phone_number INT,
     email VARCHAR(128) NOT NULL,
     PRIMARY KEY (pid)
 );