Drop support for PHP 7.0

Author: ondrejmirtes

Diff for: .travis.yml

@@ -1,6 +1,5 @@
 language: php
 php:
-  - 7.0
   - 7.1
   - 7.2
 before_script:

Diff for: composer.json

@@ -10,7 +10,7 @@
 		}
 	},
 	"require": {
-		"php": "~7.0",
+		"php": "~7.1",
 		"phpstan/phpstan": "^0.9"
 	},
 	"require-dev": {

Diff for: phpcs.xml

@@ -4,7 +4,6 @@
 		<exclude name="Squiz.Functions.GlobalFunction.Found"/>
 	</rule>
 	<rule ref="vendor/slevomat/coding-standard/SlevomatCodingStandard/ruleset.xml">
-		<exclude name="SlevomatCodingStandard.Classes.ClassConstantVisibility.MissingConstantVisibility"/>
 		<exclude name="SlevomatCodingStandard.Files.TypeNameMatchesFileName"/>
 		<exclude name="SlevomatCodingStandard.Namespaces.FullyQualifiedClassNameAfterKeyword"/>
 		<exclude name="SlevomatCodingStandard.Namespaces.UseOnlyWhitelistedNamespaces"/>
@@ -14,7 +13,6 @@
 		<exclude name="SlevomatCodingStandard.Namespaces.FullyQualifiedClassNameInAnnotation.NonFullyQualifiedClassName"/>
 		<exclude name="SlevomatCodingStandard.Namespaces.FullyQualifiedGlobalConstants"/>
 		<exclude name="SlevomatCodingStandard.Namespaces.FullyQualifiedGlobalFunctions"/>
-		<exclude name="SlevomatCodingStandard.TypeHints.NullableTypeForNullDefaultValue"/>
 	</rule>
 	<rule ref="SlevomatCodingStandard.Namespaces.AlphabeticallySortedUses">
 		<properties>
@@ -32,8 +30,6 @@
 				@dataProvider,
 				@requires
 			"/>
-			<property name="enableNullableTypeHints" type="false" />
-			<property name="enableVoidTypeHint" type="false" />
 		</properties>
 	</rule>
 </ruleset>

Diff for: tests/Rules/BooleansInConditions/BooleanInBooleanAndRuleTest.php

@@ -12,7 +12,7 @@ protected function getRule(): Rule
 		return new BooleanInBooleanAndRule();
 	}
 
-	public function testRule()
+	public function testRule(): void
 	{
 		$this->analyse([__DIR__ . '/data/conditions.php'], [
 			[

Diff for: tests/Rules/BooleansInConditions/BooleanInBooleanNotRuleTest.php

@@ -12,7 +12,7 @@ protected function getRule(): Rule
 		return new BooleanInBooleanNotRule();
 	}
 
-	public function testRule()
+	public function testRule(): void
 	{
 		$this->analyse([__DIR__ . '/data/conditions.php'], [
 			[

Diff for: tests/Rules/BooleansInConditions/BooleanInBooleanOrRuleTest.php

@@ -12,7 +12,7 @@ protected function getRule(): Rule
 		return new BooleanInBooleanOrRule();
 	}
 
-	public function testRule()
+	public function testRule(): void
 	{
 		$this->analyse([__DIR__ . '/data/conditions.php'], [
 			[

Diff for: tests/Rules/BooleansInConditions/BooleanInElseIfConditionRuleTest.php

@@ -12,7 +12,7 @@ protected function getRule(): Rule
 		return new BooleanInElseIfConditionRule();
 	}
 
-	public function testRule()
+	public function testRule(): void
 	{
 		$this->analyse([__DIR__ . '/data/conditions.php'], [
 			[

Diff for: tests/Rules/BooleansInConditions/BooleanInIfConditionRuleTest.php

@@ -12,7 +12,7 @@ protected function getRule(): Rule
 		return new BooleanInIfConditionRule();
 	}
 
-	public function testRule()
+	public function testRule(): void
 	{
 		$this->analyse([__DIR__ . '/data/conditions.php'], [
 			[

Diff for: tests/Rules/BooleansInConditions/BooleanInTernaryOperatorRuleTest.php

@@ -12,7 +12,7 @@ protected function getRule(): Rule
 		return new BooleanInTernaryOperatorRule();
 	}
 
-	public function testRule()
+	public function testRule(): void
 	{
 		$this->analyse([__DIR__ . '/data/conditions.php'], [
 			[

Diff for: tests/Rules/StrictCalls/StrictFunctionCallsRuleTest.php

@@ -12,7 +12,7 @@ protected function getRule(): Rule
 		return new StrictFunctionCallsRule($this->createBroker());
 	}
 
-	public function testRule()
+	public function testRule(): void
 	{
 		$this->analyse([__DIR__ . '/data/strict-calls.php'], [
 			[

Diff for: tests/Rules/SwitchConditions/MatchingTypeInSwitchCaseConditionRuleTest.php

@@ -12,7 +12,7 @@ protected function getRule(): Rule
 		return new MatchingTypeInSwitchCaseConditionRule(new \PhpParser\PrettyPrinter\Standard());
 	}
 
-	public function testRule()
+	public function testRule(): void
 	{
 		$this->analyse([__DIR__ . '/data/matching-type.php'], [
 			[