Fixes from review comments

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index 896b20c..d3547db 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,7 +13,7 @@
   - linux
   - osx
 
-cache: rust
+cache: cargo
 
 install:
   - rustup target add thumbv7em-none-eabi

CHANGELOG.md

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 798473d..d15206f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,7 +17,7 @@
   - `syscalls::allow_ptr` becomes `syscalls::raw::allow`
 - Targets without support for atomics can be built
 - Most API functions, including `main()`, return a `Result<T, TockError>`
-- The timer now supports to be used simultaneously
+- The library now supports parallel timers
 - all drivers can exclusively be retrieved by `retrieve_drivers` which returns a `Drivers`-singleton. Drivers can be shared between different tasks only if it is safe to do so.
 
 ## a8bb4fa9be504517d5533511fd8e607ea61f1750 (0.1.0)

run_all_checks.sh

diff --git a/run_all_checks.sh b/run_all_checks.sh
index c989212..7d96180 100755
--- a/run_all_checks.sh
+++ b/run_all_checks.sh
@@ -5,4 +5,4 @@
 cargo fmt --all -- --check
 cargo test --workspace
 cargo clippy --workspace --all-targets
-./build_examples.sh
\ No newline at end of file
+./build_examples.sh