Update platformio 1.7.X branch

code/eagle.flash.1m0m1s.ld

@@ -1,6 +1,7 @@
 /* Flash Split for 1M chips */
 /* sketch 999KB */
-/* eeprom 20KB */
+/* eeprom 4KB */
+/* reserved 16KB */
 
 MEMORY
 {

code/eagle.flash.512k0m1s.ld

@@ -1,6 +1,7 @@
 /* Flash Split for 512K chips */
 /* sketch 487KB */
-/* eeprom 20KB */
+/* eeprom 4KB */
+/* reserved 16KB */
 
 MEMORY
 {

code/platformio.ini

@@ -11,11 +11,11 @@ data_dir = espurna/data
 #
 #   platformIO 1.5.0 = arduino core 2.3.0
 #   platformIO 1.6.0 = arduino core 2.4.0
-#   platformIO 1.7.1 = arduino core 2.4.1
+#   platformIO 1.7.2 = arduino core 2.4.1
 # ------------------------------------------------------------------------------
 platform_150 = espressif8266@1.5.0
 platform_160 = espressif8266@1.6.0
-platform_171 = espressif8266@1.7.1
+platform_172 = espressif8266@1.7.2
 platform = ${common.platform_150}
 
 # ------------------------------------------------------------------------------
@@ -28,8 +28,8 @@ debug_flags = -DDEBUG_ESP_CORE -DDEBUG_ESP_SSL -DDEBUG_ESP_WIFI -DDEBUG_ESP_HTTP
 # ------------------------------------------------------------------------------
 # FLAGS: build flags
 #   build flags for 512k/1m ESP's are different because we use Linker Scripts to adjust flash split
-#    build_flags_512k ( 512 KB) =  487 KB sketch, 20 KB eeprom
-#    build_flags_1m0m (1024 KB) =  999 KB sketch, 20 KB eeprom
+#    build_flags_512k ( 512 KB) =  487 KB sketch,  4 KB eeprom, 16 KB reserved
+#    build_flags_1m0m (1024 KB) =  999 KB sketch,  4 KB eeprom, 16 KB reserved
 #    build_flags_4m1m (4096 KB) = 1019 KB sketch, 16 KB eeprom,  992 KB spiffs, 16 KB reserved, 2048 KB empty/ota?
 #    build_flags_4m3m (4096 KB) = 1019 KB sketch, 16 KB eeprom, 3040 KB spiffs, 16 KB reserved
 #