update CI, move to github actions, update README

- update CI, move to github actions, update badges
- add tagbot
- document the `topmodule` configuration parameter

Author: tanmaykm

.appveyor.yml

@@ -1,10 +1,7 @@
 environment:
   matrix:
   - julia_version: 1.0
-  - julia_version: 1.1
-  - julia_version: 1.2
-  - julia_version: 1.3
-  - julia_version: 1.4
+  - julia_version: 1
   - julia_version: nightly
 
 platform:

.github/workflows/TagBot.yml

@@ -0,0 +1,11 @@
+name: TagBot
+on:
+  schedule:
+    - cron: 0 * * * *
+jobs:
+  TagBot:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: JuliaRegistries/TagBot@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/ci.yml

@@ -0,0 +1,55 @@
+name: CI
+on:
+  push:
+    branches: [master]
+    tags: ["*"]
+  pull_request:
+jobs:
+  test:
+    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        version:
+          - '1.0'
+          - '1' # automatically expands to the latest stable 1.x release of Julia
+          - nightly
+        os:
+          - ubuntu-latest
+        arch:
+          - x64
+          - x86
+        include:
+          # test macOS and Windows with latest Julia only
+          - os: macOS-latest
+            arch: x64
+            version: 1
+          - os: windows-latest
+            arch: x64
+            version: 1
+          - os: windows-latest
+            arch: x86
+            version: 1
+    steps:
+      - uses: actions/checkout@v2
+      - uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.version }}
+          arch: ${{ matrix.arch }}
+      - uses: actions/cache@v1
+        env:
+          cache-name: cache-artifacts
+        with:
+          path: ~/.julia/artifacts
+          key: ${{ runner.os }}-test-${{ env.cache-name }}-${{ hashFiles('**/Project.toml') }}
+          restore-keys: |
+            ${{ runner.os }}-test-${{ env.cache-name }}-
+            ${{ runner.os }}-test-
+            ${{ runner.os }}-
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-runtest@v1
+      - uses: julia-actions/julia-processcoverage@v1
+      - uses: codecov/codecov-action@v1
+        with:
+          file: lcov.info

.travis.yml

@@ -1,8 +1,8 @@
 # LogCompose
 
-[![Build Status](https://travis-ci.org/tanmaykm/LogCompose.jl.png)](https://travis-ci.org/tanmaykm/LogCompose.jl) 
+[![Build Status](https://github.com/tanmaykm/LogCompose.jl/workflows/CI/badge.svg)](https://github.com/tanmaykm/LogCompose.jl/actions?query=workflow%3ACI+branch%3Amaster)
 [![Build Status](https://ci.appveyor.com/api/projects/status/github/tanmaykm/LogCompose.jl?branch=master&svg=true)](https://ci.appveyor.com/project/tanmaykm/logroller-jl/branch/master)
-[![Coverage Status](https://coveralls.io/repos/github/tanmaykm/LogCompose.jl/badge.svg?branch=master)](https://coveralls.io/github/tanmaykm/LogCompose.jl?branch=master)
+[![codecov.io](http://codecov.io/github/tanmaykm/LogCompose.jl/coverage.svg?branch=master)](http://codecov.io/github/tanmaykm/LogCompose.jl?branch=master)
 
 Provides a way to specify hierarchical logging configuration in a file.
 
@@ -61,6 +61,18 @@ There are external packages that provide support for a few other types of logger
 - LogRoller: [LogRollerCompose.jl](https://github.com/tanmaykm/LogRollerCompose.jl)
 - SyslogLogging: [SyslogLoggingCompose.jl](https://github.com/tanmaykm/SyslogLoggingCompose.jl)
 
+For loggers supplied by external packages, LogCompose looks for the logger implementation type
+(the one mentioned in `type` configuration attribute) in the `Main` module by default. But if
+your code imports the external loggers within your module instead of the Main module, then the
+module name where the logger type can be found must be specified in the (otherwise optional)
+`topmodule` configuration parameter. E.g.:
+
+```
+[loggers.rollinglog]
+type = "LogRoller.RollingFileLogger"
+topmodule = "MyModule"
+...
+```
 
 ## Examples