note flutter-required macOS minimum version (#7)

* Update en.json
* Update fa.json
* Update my.json
* Update ru.json
* Update zh.json

Author: jay-418

updater/translations/en.json

@@ -21,7 +21,7 @@
     "win10": "Windows 10+",
     "win7": "Windows 7",
     "android6": "Android 6+",
-    "osx": "macOS 10.13+",
+    "osx": "macOS 10.15+",
     "ios11": "iOS 11+",
     "ubuntu32": "Ubuntu 14.04+ (32-bit)",
     "ubuntu64": "Ubuntu 14.04+ (64-bit)",

updater/translations/fa.json

@@ -21,7 +21,7 @@
     "win10": "Windows 10+",
     "win7": "Windows 7",
     "android6": "Android 6+",
-    "osx": "macOS 10.13+",
+    "osx": "macOS 10.15+",
     "ios11": "iOS 11+",
     "ubuntu32": "Ubuntu 14.04+ (32-bit)",
     "ubuntu64": "Ubuntu 14.04+ (64-bit)",

updater/translations/my.json

@@ -21,7 +21,7 @@
     "win10": "Windows 10+",
     "win7": "Windows 7",
     "android6": "Android 6+",
-    "osx": "macOS 10.13+",
+    "osx": "macOS 10.15+",
     "ios11": "iOS 11+",
     "ubuntu32": "Ubuntu 14.04+ (32-bit)",
     "ubuntu64": "Ubuntu 14.04+ (64-bit)",

updater/translations/ru.json

@@ -21,7 +21,7 @@
     "win10": "Windows 10+",
     "win7": "Windows 7",
     "android6": "Android 6+",
-    "osx": "macOS 10.13+",
+    "osx": "macOS 10.15+",
     "ios11": "iOS 11+",
     "ubuntu32": "Ubuntu 14.04+ (32-бит)",
     "ubuntu64": "Ubuntu 14.04+ (64-бит)",

updater/translations/zh.json

@@ -21,7 +21,7 @@
     "win10": "Windows 10+",
     "win7": "Windows 7",
     "android6": "安卓 6+",
-    "osx": "苹果Mac系统 10.13+",
+    "osx": "苹果Mac系统 10.15+",
     "ios11": "苹果IOS系统 11+",
     "ubuntu32": "Ubuntu 优麒麟 14.04+ (32 位)",
     "ubuntu64": "Ubuntu 优麒麟 14.04+ (64 位)",