Changed some tech tree dependencies (#472)

prototypes/updates/base/technologies.lua

@@ -18,6 +18,7 @@ data_util.add_prerequisite("fluid-handling", "kr-basic-fluid-handling")
 data_util.add_prerequisite("gate", "electronics")
 data_util.add_prerequisite("heavy-armor", "light-armor")
 data_util.add_prerequisite("kr-iron-pickaxe", "kr-automation-core")
+data_util.add_prerequisite("kr-railgun-turret", "gun-turret")
 data_util.add_prerequisite(kr_optimization_tech_card_name, "kr-singularity-lab")
 data_util.add_prerequisite("lamp", "kr-stone-processing")
 data_util.add_prerequisite("logistics-2", "steel-processing")
@@ -30,6 +31,7 @@ data_util.add_prerequisite("production-science-pack", "kr-advanced-lab")
 data_util.add_prerequisite("production-science-pack", "kr-research-server")
 data_util.add_prerequisite("production-science-pack", "uranium-processing")
 data_util.add_prerequisite("productivity-module-3", "processing-unit")
+data_util.add_prerequisite("rocket-fuel", "kr-fuel")
 data_util.add_prerequisite("solar-energy", "kr-silicon-processing")
 data_util.add_prerequisite("speed-module-3", "processing-unit")
 data_util.add_prerequisite("spidertron", "kr-ai-core")
@@ -40,6 +42,8 @@ data_util.add_prerequisite("tank", "kr-fuel")
 data_util.add_prerequisite("utility-science-pack", "kr-advanced-lab")
 data_util.add_prerequisite("utility-science-pack", "kr-research-server")
 data_util.add_prerequisite("utility-science-pack", "rocket-fuel")
+data_util.add_prerequisite("kr-advanced-tech-card", "kr-lithium-sulfur-battery")
+data_util.add_prerequisite("kr-matter-tech-card", "kr-lithium-processing")
 
 data_util.remove_prerequisite("atomic-bomb", "military-4")
 data_util.remove_prerequisite("automation", "automation-science-pack")
@@ -51,6 +55,7 @@ data_util.remove_prerequisite("engine", "steel-processing")
 data_util.remove_prerequisite("fluid-handling", "automation-2")
 data_util.remove_prerequisite("gate", "military-2")
 data_util.remove_prerequisite("heavy-armor", "military")
+data_util.remove_prerequisite("kovarex-enrichment-process", "rocket-fuel")
 data_util.remove_prerequisite("productivity-module-2", "processing-unit")
 data_util.remove_prerequisite("speed-module-2", "processing-unit")