FIX: 루틴 수정/작성 API request의 시작/종료일자를 nullable하지 않도록 수정

Author: l5x5l

data/src/main/java/com/threegap/bitnagil/data/writeroutine/model/request/EditRoutineRequest.kt

@@ -14,9 +14,9 @@ data class EditRoutineRequest(
     @SerialName("repeatDay")
     val repeatDay: List<String>,
     @SerialName("routineStartDate")
-    val routineStartDate: String?,
+    val routineStartDate: String,
     @SerialName("routineEndDate")
-    val routineEndDate: String?,
+    val routineEndDate: String,
     @SerialName("executionTime")
     val executionTime: String,
     @SerialName("subRoutineName")

data/src/main/java/com/threegap/bitnagil/data/writeroutine/model/request/RegisterRoutineRequest.kt

@@ -10,9 +10,9 @@ data class RegisterRoutineRequest(
     @SerialName("repeatDay")
     val repeatDay: List<String>,
     @SerialName("routineStartDate")
-    val routineStartDate: String?,
+    val routineStartDate: String,
     @SerialName("routineEndDate")
-    val routineEndDate: String?,
+    val routineEndDate: String,
     @SerialName("executionTime")
     val executionTime: String,
     @SerialName("subRoutineName")