Fix build configuration typo

Author: Filipe GOMES PEIXOTO

.travis.yml

@@ -1,27 +1,26 @@
 language: csharp
 mono: none
-dotnet: 3.0.100
 
 env:
   global:
     - DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true
     - DOTNET_CLI_TELEMETRY_OPTOUT: 1
-
-env:
-  - PROJECT_NAME="EntityFrameworkCore.DataEncryption"
+    - PROJECT_NAME: "EntityFrameworkCore.DataEncryption"
 
 jobs:
   include:
   - os: linux
     dist: xenial
     sudo: required
+    dotnet: 2.2
     env:
       - FRAMEWORK="netstandard2.0"
       - FRAMEWORK_TEST="netcoreapp2.2"
     name: ".NET Core 2 (Linux: Ubuntu Xenial)"
-  - os: Linux
+  - os: linux
     dist: xenial
     sudo: required
+    dotnet: 3.0.100
     env:
       - FRAMEWORK="netstandard2.1"
       - FRAMEWORK_TEST="netcoreapp3.0"