message: Update mono version
diff: "runtimeDependencies": [
  {
  "description": "Mono Runtime (Linux / x86)",
  - "url": "https://omnisharpdownload.blob.core.windows.net/ext/mono.linux-x86-4.8.0.478.zip",
  + "url": "https://omnisharpdownload.blob.core.windows.net/ext/mono.linux-x86-5.2.0.104.zip",
  "installPath": "./bin",
  "platforms": [
  "linux"
  },
  {
  "description": "Mono Runtime (Linux / x64)",
  - "url": "https://omnisharpdownload.blob.core.windows.net/ext/mono.linux-x86_64-4.8.0.478.zip",
  + "url": "https://omnisharpdownload.blob.core.windows.net/ext/mono.linux-x86_64-5.2.0.104.zip",
  "installPath": "./bin",
  "platforms": [
  "linux"
  },
  {
  "description": "Mono Runtime (macOS)",
  - "url": "https://omnisharpdownload.blob.core.windows.net/ext/mono.osx-4.8.0.478.zip",
  + "url": "https://omnisharpdownload.blob.core.windows.net/ext/mono.osx-5.2.0.104.zip",
  "installPath": "./bin",
  "platforms": [
  "darwin"
  },
  {
  "description": "Mono Framework Assemblies",
  - "url": "https://omnisharpdownload.blob.core.windows.net/ext/framework-4.8.0.478.zip",
  + "url": "https://omnisharpdownload.blob.core.windows.net/ext/framework-5.2.0.104.zip",
  "installPath": "./bin/framework",
  "platforms": [
  "darwin",
  