Remove file ending of shellcheck_all and downgrade_dependencies script

.cargo-husky/hooks/pre-push

@@ -14,5 +14,5 @@ cargo clippy --all-features --all-targets -- -D warnings
 echo '+cargo test --all'
 cargo test --all
 
-echo '+./maint/shellcheck_all.sh'
+echo '+./maint/shellcheck_all'
-./maint/shellcheck_all.sh
+./maint/shellcheck_all

.gitlab-ci.yml

@@ -17,7 +17,8 @@ shellcheck:
   stage: check
   image: koalaman/shellcheck-alpine
   script:
-    - ./maint/shellcheck_all.sh
+    - apk add git
+    - ./maint/shellcheck_all
 
 rust-latest:
   stage: build
@@ -99,7 +100,7 @@ minimal-versions:
   image: rust:1.53
   script:
     - rustup install nightly
-    - ./maint/downgrade_dependencies.sh
+    - ./maint/downgrade_dependencies
     - cargo build --verbose --target x86_64-unknown-linux-gnu --all-features
     - cargo test --verbose --target x86_64-unknown-linux-gnu --all-features
   tags:

maint/shellcheck_all

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+git grep -P --line-number '^#! ?/bin/(:?ba)?sh\b' | sed -n 's/:1:[^:]*$//p' | xargs shellcheck

maint/shellcheck_all.sh

@@ -1,3 +0,0 @@
-#!/bin/sh
-
-shellcheck ./**/*.sh