Update arm32v7 base image to .NET Core 2.1 (#36)

Author: LazarusX

Microsoft.Azure.IoT.Edge.Module.nuspec

@@ -2,7 +2,7 @@
 <package>
     <metadata>
     <id>Microsoft.Azure.IoT.Edge.Module</id>
-    <version>2.0.0-rc4</version>
+    <version>2.0.0-rc5</version>
     <title>Azure IoT Edge Module</title>
     <authors>Microsoft</authors>
     <owners>microsoft, nugetazureiotedge</owners>

content/dotnet-template-azure-iot-edge-module/CSharp/Dockerfile.arm32v7

@@ -1,4 +1,4 @@
-FROM microsoft/dotnet:2.0-sdk AS build-env
+FROM microsoft/dotnet:2.1-sdk AS build-env
 WORKDIR /app
 
 COPY *.csproj ./
@@ -7,7 +7,7 @@ RUN dotnet restore
 COPY . ./
 RUN dotnet publish -c Release -o out
 
-FROM microsoft/dotnet:2.0-runtime-stretch-arm32v7
+FROM microsoft/dotnet:2.1-runtime-stretch-slim-arm32v7
 WORKDIR /app
 COPY --from=build-env /app/out ./
 

content/dotnet-template-azure-iot-edge-module/FSharp/Dockerfile.arm32v7

@@ -1,4 +1,4 @@
-FROM microsoft/dotnet:2.0-sdk AS build-env
+FROM microsoft/dotnet:2.1-sdk AS build-env
 WORKDIR /app
 
 COPY *.fsproj ./
@@ -7,7 +7,7 @@ RUN dotnet restore
 COPY . ./
 RUN dotnet publish -c Release -o out
 
-FROM microsoft/dotnet:2.0-runtime-stretch-arm32v7
+FROM microsoft/dotnet:2.1-runtime-stretch-slim-arm32v7
 WORKDIR /app
 COPY --from=build-env /app/out ./