linux-headers: bump 3.18.x and 4.1.x series

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/linux-headers/Config.in.host

@@ -214,10 +214,10 @@ config BR2_DEFAULT_KERNEL_HEADERS
 	default "3.12.55"	if BR2_KERNEL_HEADERS_3_12
 	default "3.14.63"	if BR2_KERNEL_HEADERS_3_14
 	default "3.17.8"	if BR2_KERNEL_HEADERS_3_17
-	default "3.18.27"	if BR2_KERNEL_HEADERS_3_18
+	default "3.18.28"	if BR2_KERNEL_HEADERS_3_18
 	default "3.19.8"	if BR2_KERNEL_HEADERS_3_19
 	default "4.0.9"		if BR2_KERNEL_HEADERS_4_0
-	default "4.1.18"	if BR2_KERNEL_HEADERS_4_1
+	default "4.1.19"	if BR2_KERNEL_HEADERS_4_1
 	default "4.2.8"		if BR2_KERNEL_HEADERS_4_2
 	default "4.3.6"		if BR2_KERNEL_HEADERS_4_3
 	default "4.4.4"		if BR2_KERNEL_HEADERS_4_4