update to mdbook 0.4.x

https://blog.rust-lang.org/2021/01/04/mdbook-security-advisory.html
OpenRA · Jan 4, 2021 · a519179 · a519179
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commit a519179
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diff --git a/.travis.yml b/.travis.yml
@@ -11,7 +11,7 @@ cache:
   - mdbook
 
 before_install:
-  - (test -x "${HOME}/.cargo/bin/mdbook" || cargo install mdbook --no-default-features --features output --vers "^0.2")
+  - (test -x "${HOME}/.cargo/bin/mdbook" || cargo install mdbook --no-default-features --features output --vers "^0.4")
 
 script:
   - mdbook build

diff --git a/README.md b/README.md
@@ -23,7 +23,7 @@ That summary is not a substitute for the [LICENSE].
 
 ## Requirements
 
-- [`mdbook`] version 0.2.x
+- [`mdbook`] version 0.4.x
 
 **NOTE**: macOS users will need to install `mdbook` via [`cargo`] since mdbook
 does not distribute macOS binaries. See [mdbook#installation] for more